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Polyglot runtime manager (asdf rust clone)

Features

  • asdf-compatible - rtx is compatible with asdf plugins and .tool-versions files. It can be used as a drop-in replacement. See below for migration instructions
  • Polyglot - compatible with any language, so no more figuring out how nvm, nodenv, pyenv, etc work individually—just use 1 tool.
  • Fast - rtx is written in Rust and is very fast. 20x-200x faster than asdf.
  • No shims - shims cause problems, they break which, and add overhead. By default, rtx does not use them—however you can if you want to.
  • Fuzzy matching and aliases - It's enough to just say you want "v20" of node, or the "lts" version. rtx will figure out the right version without you needing to specify an exact version.
  • Arbitrary env vars - Set custom env vars when in a project directory like NODE_ENV=production or AWS_PROFILE=staging.

30 Second Demo

The following shows using rtx to install different versions of node. Note that calling which node gives us a real path to node, not a shim.

demo

Quickstart

Install rtx on macOS (other methods here):

$ curl https://rtx.pub/rtx-latest-macos-arm64 > ~/bin/rtx
$ chmod +x ~/bin/rtx
$ rtx --version
rtx 2023.12.19

Hook rtx into your shell (pick the right one for your shell):

# note this assumes rtx is located at ~/bin/rtx
echo 'eval "$(~/bin/rtx activate bash)"' >> ~/.bashrc
echo 'eval "$(~/bin/rtx activate zsh)"' >> ~/.zshrc
echo '~/bin/rtx activate fish | source' >> ~/.config/fish/config.fish

Warning

If you use direnv with layout python or other logic that needs to reference rtx runtimes inside of an .envrc, see the direnv section below.

Install a runtime and set it as the global default:

$ rtx use --global node@20
$ node -v
v20.0.0

Table of Contents

Click to expand

About

New developer? Try reading the Beginner's Guide for a gentler introduction.

rtx is a tool for managing programming language and tool versions. For example, use this to install a particular version of Node.js and ruby for a project. Using rtx activate, you can have your shell automatically switch to the correct node and ruby versions when you cd into the project's directory1. Other projects on your machine can use a different set of versions.

rtx is inspired by asdf and uses asdf's vast plugin ecosystem under the hood. However, it is much faster than asdf and has a more friendly user experience. For more on how rtx compares to asdf, see below.

rtx can be configured in many ways. The most typical is by .rtx.toml, but it's also compatible with asdf .tool-versions files. It can also use idiomatic version files like .node-version and .ruby-version. See Configuration for more.

How it works

rtx hooks into your shell (with rtx activate zsh) and sets the PATH environment variable to point your shell to the correct runtime binaries. When you cd into a directory1 containing a .tool-versions/.rtx.toml file, rtx will automatically set the appropriate tool versions in PATH.

After activating, every time your prompt displays it will call rtx hook-env to fetch new environment variables. This should be very fast. It exits early if the directory wasn't changed or .tool-versions/.rtx.toml files haven't been modified.

Unlike asdf which uses shim files to dynamically locate runtimes when they're called, rtx modifies PATH ahead of time so the runtimes are called directly. This is not only faster since it avoids any overhead, but it also makes it so commands like which node work as expected. This also means there isn't any need to run asdf reshim after installing new runtime binaries.

You should note that rtx does not directly install these tools. Instead, it leverages plugins to install runtimes. See plugins below.

Common commands

rtx install [email protected]  Install a specific version number
rtx install node@20      Install a fuzzy version number
rtx use node@20          Use node-20.x in current project
rtx use -g node@20       Use node-20.x as global default

rtx install node         Install the current version specified in .tool-versions/.rtx.toml
rtx use node@latest      Use latest node in current directory
rtx use -g node@system   Use system node as global default

rtx x node@20 -- node app.js  Run `node app.js` node-20.x on PATH

Installation

Installing rtx consists of two steps.

  1. Download the binary. This depends on the device and operating system you are running rtx in.
  2. Register a shell hook. This depends on the shell you are using. Read more about this step in the FAQ.

Download binary

Standalone Note that it isn't necessary for `rtx` to be on `PATH`. If you run the activate script in your rc file, rtx will automatically add itself to `PATH`. 
curl https://rtx.pub/install.sh | sh

If you want to verify the install script hasn't been tampered with:

gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 0x29DDE9E0
curl https://rtx.pub/install.sh.sig | gpg --decrypt > install.sh
# ensure the above is signed with the rtx release key
sh ./install.sh

or if you're allergic to | sh:

curl https://rtx.pub/rtx-latest-macos-arm64 > /usr/local/bin/rtx

It doesn't matter where you put it. So use ~/bin, /usr/local/bin, ~/.local/share/rtx/bin/rtx or whatever.

Supported architectures:

  • x64
  • arm64

Supported platforms:

  • macos
  • linux

If you need something else, compile it with cargo install rtx-cli (see below). Windows isn't currently supported.

Homebrew 
brew install rtx

Alternatively, use the custom tap (which is updated immediately after a release)):

brew install jdx/tap/rtx
MacPorts 
sudo port install rtx
Cargo

Build from source with Cargo:

cargo install rtx-cli

Do it faster with cargo-binstall:

cargo install cargo-binstall
cargo binstall rtx-cli

Build from the latest commit in main:

cargo install rtx-cli --git https://github.com/jdx/rtx --branch main
npm

rtx is available on npm as a precompiled binary. This isn't a Node.js package—just distributed via npm. This is useful for JS projects that want to setup rtx via package.json or npx.

npm install -g rtx-cli

Use npx if you just want to test it out for a single command without fully installing:

npx rtx-cli exec [email protected] -- python some_script.py
GitHub Releases

Download the latest release from GitHub.

curl https://github.com/jdx/rtx/releases/download/v2023.12.19/rtx-v2023.12.19-linux-x64 > /usr/local/bin/rtx
chmod +x /usr/local/bin/rtx
apt

For installation on Ubuntu/Debian:

sudo install -dm 755 /etc/apt/keyrings
wget -qO - https://rtx.pub/gpg-key.pub | gpg --dearmor | sudo tee /etc/apt/keyrings/rtx-archive-keyring.gpg 1> /dev/null
echo "deb [signed-by=/etc/apt/keyrings/rtx-archive-keyring.gpg arch=amd64] https://rtx.pub/deb stable main" | sudo tee /etc/apt/sources.list.d/rtx.list
sudo apt update
sudo apt install -y rtx

Warning

If you're on arm64 you'll need to run the following:

echo "deb [signed-by=/etc/apt/keyrings/rtx-archive-keyring.gpg arch=arm64] https://rtx.pub/deb stable main" | sudo tee /etc/apt/sources.list.d/rtx.list
dnf

For Fedora, CentOS, Amazon Linux, RHEL and other dnf-based distributions:

dnf install -y dnf-plugins-core
dnf config-manager --add-repo https://rtx.pub/rpm/rtx.repo
dnf install -y rtx
yum 
yum install -y yum-utils
yum-config-manager --add-repo https://rtx.pub/rpm/rtx.repo
yum install -y rtx
apk

For Alpine Linux:

apk add rtx

rtx lives in the community repository.

aur

For Arch Linux:

git clone https://aur.archlinux.org/rtx.git
cd rtx
makepkg -si
nix

For the Nix package manager, at release 23.05 or later:

nix-env -iA rtx

You can also import the package directly using rtx-flake.packages.${system}.rtx. It supports all default Nix systems.

Docker 
docker run jdxcode/rtx x node@20 -- node -v

Register shell hook

Bash

echo 'eval "$(rtx activate bash)"' >> ~/.bashrc

Zsh

echo 'eval "$(rtx activate zsh)"' >> "${ZDOTDIR-$HOME}/.zshrc"

Fish

echo 'rtx activate fish | source' >> ~/.config/fish/config.fish

Note:

For homebrew and possibly other installs rtx is automatically activated so this is not necessary.

See RTX_FISH_AUTO_ACTIVATE=1 for more information.

Nushell

do {
  let rtxpath = ($nu.config-path | path dirname | path join "rtx.nu")
  run-external rtx activate nu --redirect-stdout | save $rtxpath -f
  $"\nsource "($rtxpath)"" | save $nu.config-path --append
}

Xonsh

Since .xsh files are not compiled you may shave a bit off startup time by using a pure Python import: add the code below to, for example, ~/.config/xonsh/rtx.py config file and import rtx it in ~/.config/xonsh/rc.xsh:

from pathlib         import Path
from xonsh.built_ins import XSH

ctx = XSH.ctx
rtx_init = subprocess.run([Path('~/bin/rtx').expanduser(),'activate','xonsh'],capture_output=True,encoding="UTF-8").stdout
XSH.builtins.execx(rtx_init,'exec',ctx,filename='rtx')

Or continue to use rc.xsh/.xonshrc:

echo 'execx($(~/bin/rtx activate xonsh))' >> ~/.config/xonsh/rc.xsh # or ~/.xonshrc

Given that rtx replaces both shell env $PATH and OS environ PATH, watch out that your configs don't have these two set differently (might throw os.environ['PATH'] = xonsh.built_ins.XSH.env.get_detyped('PATH') at the end of a config to make sure they match)

Something else?

Adding a new shell is not hard at all since very little shell code is in this project. See here for how the others are implemented. If your shell isn't currently supported I'd be happy to help you get yours integrated.

Migrate from asdf

If you're moving from asdf to rtx, please review How do I migrate from asdf? for guidance.

Uninstalling

Use rtx implode to uninstall rtx. This will remove the rtx binary and all of its data. Use rtx implode --help for more information.

Alternatively, manually remove the following directories to fully clean up:

  • ~/.local/share/rtx (can also be RTX_DATA_DIR or XDG_DATA_HOME/rtx)
  • ~/.config/rtx (can also be RTX_CONFIG_DIR or XDG_CONFIG_HOME/rtx)
  • on Linux: ~/.cache/rtx (can also be RTX_CACHE_DIR or XDG_CACHE_HOME/rtx)
  • on macOS: ~/Library/Caches/rtx (can also be RTX_CACHE_DIR)

Shebang

You can specify a tool and its version in a shebang without needing to first setup .tool-versions/.rtx.toml config:

#!/usr/bin/env -S rtx x node@20 -- node
// "env -S" allows multiple arguments in a shebang
console.log(`Running node: ${process.version}`);

This can also be useful in environments where rtx isn't activated (such as a non-interactive session).

Configuration

.rtx.toml

.rtx.toml is a new config file that replaces asdf-style .tool-versions files with a file that has lot more flexibility. It supports functionality that is not possible with .tool-versions, such as:

  • setting arbitrary env vars while inside the directory
  • passing options to plugins like virtualenv='.venv' for python.
  • specifying custom plugin URLs

Here is what an .rtx.toml looks like:

[env]
# supports arbitrary env vars so rtx can be used like direnv/dotenv
NODE_ENV = 'production'

[tools]
# specify single or multiple versions
terraform = '1.0.0'
erlang = ['23.3', '24.0']

# supports everything you can do with .tool-versions currently
node = ['16', 'prefix:20', 'ref:master', 'path:~/.nodes/14']

# send arbitrary options to the plugin, passed as:
# RTX_TOOL_OPTS__VENV=.venv
python = {version='3.10', virtualenv='.venv'}

[plugins]
# specify a custom repo url
# note this will only be used if the plugin does not already exist
python = 'https://github.com/asdf-community/asdf-python'

[settings] # project-local settings
verbose = true

[alias.node] # project-local aliases
my_custom_node = '20'

.rtx.toml files are hierarchical. The configuration in a file in the current directory will override conflicting configuration in parent directories. For example, if ~/src/myproj/.rtx.toml defines the following:

[tools]
node = '20'
python = '3.10'

And ~/src/myproj/backend/.rtx.toml defines:

[tools]
node = '18'
ruby = '3.1'

Then when inside of ~/src/myproj/backend, node will be 18, python will be 3.10, and ruby will be 3.1. You can check the active versions with rtx ls --current.

You can also have environment specific config files like .rtx.production.toml, see Config Environments for more details.

[env] - Arbitrary Environment Variables

The [env] section of .rtx.toml allows setting arbitrary environment variables. These can be simple key-value entries like this:

[env]
NODE_ENV = 'production'

PATH is treated specially, it needs to be defined as an array in env_path:

env_path = [
    # adds an absolute path
    "~/.local/share/bin",
    # adds a path relative to the .rtx.toml, not PWD
    "./node_modules/.bin",
]

Note: env_path is a top-level key, it does not go inside of [env].

Environment variable values can be templates, see Templates for details.

[env]
LD_LIBRARY_PATH = "/some/path:{{env.LD_LIBRARY_PATH}}"

env_file can be used to specify a dotenv file to load:

env_file = '.env'

Note: env_file goes at the top of the file, above [env].

[env]
NODE_ENV = false # unset a previously set NODE_ENV

[plugins] - Specify Custom Plugin Repository URLs

Use [plugins] to add/modify plugin shortnames. Note that this will only modify new plugin installations. Existing plugins can use any URL.

[plugins]
elixir = "https://github.com/my-org/rtx-elixir.git"
node = "https://github.com/my-org/rtx-node.git#DEADBEEF" # supports specific gitref

If you simply want to install a plugin from a specific URL once, it's better to use rtx plugin install plugin <GIT_URL>. Add this section to .rtx.toml if you want to share the plugin location/revision with other developers in your project.

This is similar to RTX_SHORTHANDS but doesn't require a separate file.

Legacy version files

rtx supports "legacy version files" just like asdf. They're language-specific files like .node-version and .python-version. These are ideal for setting the runtime version of a project without forcing other developers to use a specific tool like rtx/asdf.

They support aliases, which means you can have an .nvmrc file with lts/hydrogen and it will work in rtx and nvm. Here are some of the supported legacy version files:

Plugin "Legacy" (Idiomatic) Files
crystal .crystal-version
elixir .exenv-version
go .go-version, go.mod
java .java-version, .sdkmanrc
node .nvmrc, .node-version
python .python-version
ruby .ruby-version, Gemfile
terraform .terraform-version, .packer-version, main.tf
yarn .yarnrc

In rtx these are enabled by default. You can disable them with rtx settings set legacy_version_file false. There is a performance cost to having these when they're parsed as it's performed by the plugin in bin/parse-version-file. However these are cached so it's not a huge deal. You may not even notice.

Note

asdf calls these "legacy version files" so we do too. I think this is a bad name since it implies that they shouldn't be used—which is definitely not the case IMO. I prefer the term "idiomatic" version files since they're version files not specific to asdf/rtx and can be used by other tools. (.nvmrc being a notable exception, which is tied to a specific tool.)

.tool-versions

The .tool-versions file is asdf's config file and it can be used in rtx just like .rtx.toml. It isn't as flexible so it's recommended to use .rtx.toml instead. It can be useful if you already have a lot of .tool-versions files or work on a team that uses asdf.

Here is an example with all the supported syntax:

node        20.0.0       # comments are allowed
ruby        3            # can be fuzzy version
shellcheck  latest       # also supports "latest"
jq          1.6
erlang      ref:master   # compile from vcs ref
go          prefix:1.19  # uses the latest 1.19.x version—needed in case "1.19" is an exact match
shfmt       path:./shfmt # use a custom runtime
node        lts          # use lts version of node (not supported by all plugins)

node        sub-2:lts      # install 2 versions behind the latest lts (e.g.: 18 if lts is 20)
python      sub-0.1:latest # install python-3.10 if the latest is 3.11

See the asdf docs for more info on this file format.

Scopes

Both .rtx.toml and .tool-versions support "scopes" which modify the behavior of the version:

  • ref:<SHA> - compile from a vcs (usually git) ref
  • prefix:<PREFIX> - use the latest version that matches the prefix. Useful for Go since 1.20 would only match 1.20 exactly but prefix:1.20 will match 1.20.1 and 1.20.2 etc.
  • path:<PATH> - use a custom compiled version at the given path. One use-case is to re-use Homebrew tools (e.g.: path:/opt/homebrew/opt/node@20).
  • sub-<PARTIAL_VERSION>:<ORIG_VERSION> - subtracts PARTIAL_VERSION from ORIG_VERSION. This can be used to express something like "2 versions behind lts" such as sub-2:lts. Or 1 minor version behind the latest version: sub-0.1:latest.

Global config: ~/.config/rtx/config.toml

rtx can be configured in ~/.config/rtx/config.toml. It's like local .rtx.toml files except that it is used for all directories.

[tools]
# global tool versions go here
# you can set these with `rtx use -g`
node = 'lts'
python = ['3.10', '3.11']

[settings]
# plugins can read the versions files used by other version managers (if enabled by the plugin)
# for example, .nvmrc in the case of node's nvm
legacy_version_file = true                     # enabled by default (unlike asdf)
legacy_version_file_disable_tools = ['python'] # disable for specific tools

# configure `rtx install` to always keep the downloaded archive
always_keep_download = false        # deleted after install by default
always_keep_install = false         # deleted on failure by default

# configure how frequently (in minutes) to fetch updated plugin repository changes
# this is updated whenever a new runtime is installed
# (note: this isn't currently implemented but there are plans to add it: https://github.com/jdx/rtx/issues/128)
plugin_autoupdate_last_check_duration = '1 week' # set to 0 to disable updates

# config files with these prefixes will be trusted by default
trusted_config_paths = [
    '~/work/my-trusted-projects',
]

verbose = false     # set to true to see full installation output, see `RTX_VERBOSE`
asdf_compat = false # set to true to ensure .tool-versions will be compatible with asdf, see `RTX_ASDF_COMPAT`
jobs = 4            # number of plugins or runtimes to install in parallel. The default is `4`.
raw = false         # set to true to directly pipe plugins to stdin/stdout/stderr
yes = false         # set to true to automatically answer yes to all prompts

shorthands_file = '~/.config/rtx/shorthands.toml' # path to the shorthands file, see `RTX_SHORTHANDS_FILE`
disable_default_shorthands = false # disable the default shorthands, see `RTX_DISABLE_DEFAULT_SHORTHANDS`
disable_tools = ['node']           # disable specific tools, generally used to turn off core tools

experimental = false # enable experimental features
log_level = 'debug' # log verbosity, see `RTX_LOG_LEVEL`

[alias.node]
my_custom_node = '20'  # makes `rtx install node@my_custom_node` install node-20.x
                       # this can also be specified in a plugin (see below in "Aliases")

These settings can also be managed with rtx settings ls|get|set|unset.

Environment variables

rtx can also be configured via environment variables. The following options are available:

RTX_DATA_DIR

Default: ~/.local/share/rtx or $XDG_DATA_HOME/rtx

This is the directory where rtx stores plugins and tool installs. These are not supposed to be shared across machines.

RTX_CACHE_DIR

Default (Linux): ~/.cache/rtx or $XDG_CACHE_HOME/rtx Default (macOS): ~/Library/Caches/rtx or $XDG_CACHE_HOME/rtx

This is the directory where rtx stores internal cache. This is not supposed to be shared across machines. It may be deleted at any time rtx is not running.

RTX_TMP_DIR

Default: std::env::temp_dir() implementation in rust

This is used for temporary storage such as when installing tools.

RTX_CONFIG_FILE

Default: $RTX_CONFIG_DIR/config.toml (Usually ~/.config/rtx/config.toml)

This is the path to the config file.

RTX_DEFAULT_TOOL_VERSIONS_FILENAME

Set to something other than ".tool-versions" to have rtx look for .tool-versions files but with a different name.

RTX_DEFAULT_CONFIG_FILENAME

Set to something other than .rtx.toml to have rtx look for .rtx.toml config files with a different name.

[experimental] RTX_ENV

Enables environment-specific config files such as .rtx.development.toml. Use this for different env vars or different tool versions in development/staging/production environments. See Config Environments for more on how to use this feature.

RTX_${PLUGIN}_VERSION

Set the version for a runtime. For example, RTX_NODE_VERSION=20 will use [email protected] regardless of what is set in .tool-versions/.rtx.toml.

RTX_LEGACY_VERSION_FILE=1

Plugins can read the versions files used by other version managers (if enabled by the plugin) for example, .nvmrc in the case of node's nvm. See legacy version files for more information.

Set to "0" to disable legacy version file parsing.

RTX_LEGACY_VERSION_FILE_DISABLE_TOOLS=node,python

Disable legacy version file parsing for specific tools. Separate with ,.

RTX_USE_TOML=0

Set to 1 to default to using .rtx.toml in rtx local instead of .tool-versions for configuration.

For now this is not used by rtx use which will only use .rtx.toml unless --path is specified.

RTX_TRUSTED_CONFIG_PATHS

This is a list of paths that rtx will automatically mark as trusted. They can be separated with :.

RTX_LOG_LEVEL=trace|debug|info|warn|error

These change the verbosity of rtx.

You can also use RTX_DEBUG=1, RTX_TRACE=1, and RTX_QUIET=1 as well as --log-level=trace|debug|info|warn|error.

RTX_LOG_FILE=~/rtx.log

Output logs to a file.

RTX_LOG_FILE_LEVEL=trace|debug|info|warn|error

Same as RTX_LOG_LEVEL but for the log file output level. This is useful if you want to store the logs but not have them litter your display.

RTX_ALWAYS_KEEP_DOWNLOAD=1

Set to "1" to always keep the downloaded archive. By default it is deleted after install.

RTX_ALWAYS_KEEP_INSTALL=1

Set to "1" to always keep the install directory. By default it is deleted on failure.

RTX_VERBOSE=1

This shows the installation output during rtx install and rtx plugin install. This should likely be merged so it behaves the same as RTX_DEBUG=1 and we don't have 2 configuration for the same thing, but for now it is its own config.

RTX_ASDF_COMPAT=1

Only output .tool-versions files in rtx local|global which will be usable by asdf. This disables rtx functionality that would otherwise make these files incompatible with asdf.

RTX_JOBS=1

Set the number plugins or runtimes to install in parallel. The default is 4.

RTX_RAW=1

Set to "1" to directly pipe plugin scripts to stdin/stdout/stderr. By default stdin is disabled because when installing a bunch of plugins in parallel you won't see the prompt. Use this if a plugin accepts input or otherwise does not seem to be installing correctly.

Sets RTX_JOBS=1 because only 1 plugin script can be executed at a time.

RTX_SHORTHANDS_FILE=~/.config/rtx/shorthands.toml

Use a custom file for the shorthand aliases. This is useful if you want to share plugins within an organization.

Shorthands make it so when a user runs something like rtx install elixir rtx will automatically install the asdf-elixir plugin. By default, it uses the shorthands in src/default_shorthands.rs.

The file should be in this toml format:

elixir = "https://github.com/my-org/rtx-elixir.git"
node = "https://github.com/my-org/rtx-node.git"

RTX_DISABLE_DEFAULT_SHORTHANDS=1

Disables the shorthand aliases for installing plugins. You will have to specify full URLs when installing plugins, e.g.: rtx plugin install node https://github.com/asdf-vm/asdf-node.git

RTX_DISABLE_TOOLS=python,node

Disables the specified tools. Separate with ,. Generally used for core plugins but works with all.

RTX_YES=1

This will automatically answer yes or no to prompts. This is useful for scripting.

RTX_EXPERIMENTAL=1

Enables experimental features.

RTX_ALL_COMPILE=1

Default: false unless running NixOS or Alpine (let me know if others should be added)

Do not use precompiled binaries for all languages. Useful if running on a Linux distrobution like Alpine that does not use glibc and therefore likely won't be able to run precompiled binaries.

Note that this needs to be setup for each language. File a ticket if you notice a language that is not working with this config.

RTX_FISH_AUTO_ACTIVATE=1

Configures the vendor_conf.d script for fish shell to automatically activate. This file is automatically used in homebrew and potentially other installs to automatically activate rtx without configuring.

Defaults to enabled, set to "0" to disable.

Aliases

rtx supports aliasing the versions of runtimes. One use-case for this is to define aliases for LTS versions of runtimes. For example, you may want to specify lts-hydrogen as the version for [email protected] so you can use set it with node lts-hydrogen in .tool-versions/.rtx.toml.

User aliases can be created by adding an alias.<PLUGIN> section to ~/.config/rtx/config.toml:

[alias.node]
my_custom_20 = '20'

Plugins can also provide aliases via a bin/list-aliases script. Here is an example showing node.js versions:

#!/usr/bin/env bash

echo "lts-hydrogen 18"
echo "lts-gallium 16"
echo "lts-fermium 14"

Note:

Because this is rtx-specific functionality not currently used by asdf it isn't likely to be in any plugin currently, but plugin authors can add this script without impacting asdf users.

Plugins

rtx uses asdf's plugin ecosystem under the hood. These plugins contain shell scripts like bin/install (for installing) and bin/list-all (for listing all of the available versions).

See https://github.com/asdf-vm/asdf-plugins for the list of built-in plugins shorthands. See asdf's Create a Plugin for how to create your own or just learn more about how they work.

Plugin Options

rtx has support for "plugin options" which is configuration specified in .rtx.toml to change behavior of plugins. One example of this is virtualenv on python runtimes:

[tools]
python = {version='3.11', virtualenv='.venv'}

This will be passed to all plugin scripts as RTX_TOOL_OPTS__VIRTUALENV=.venv. The user can specify any option and it will be passed to the plugin in that format.

Currently this only supports simple strings, but we can make it compatible with more complex types (arrays, tables) fairly easily if there is a need for it.

Versioning

rtx uses Calver versioning (2023.6.1). Breaking changes will be few but when they do happen, they will be communicated in the CLI with plenty of notice whenever possible.

Rather than have SemVer major releases to communicate change in large releases, new functionality and changes can be opted-into with settings like experimental = true. This way plugin authors and users can test out new functionality immediately without waiting for a major release.

The numbers in Calver (YYYY.MM.RELEASE) simply represent the date of the release—not compatibility or how many new features were added. Each release will be small and incremental.

Directories

The following are the directories that rtx uses. These are the default directories, see Configuration for information on changing the locations.

Tip

If you often find yourself using these directories (as I do), I suggest setting all of them to ~/.rtx for easy access.

~/.config/rtx

This directory stores the global configuration file ~/.config/rtx/config.toml.

~/.cache/rtx

On macOS this is ~/Library/Caches/rtx.

Stores internal cache that rtx uses for things like the list of all available versions of a plugin. See Cache Behavior for more information.

~/.local/share/rtx

This is the main directory that rtx uses and is where plugins and tools are installed into. It is nearly identical to ~/.asdf in asdf, so much so that you may be able to get by symlinking these together and using asdf and rtx simultaneously. (Supporting this isn't a project goal, however).

~/.local/share/rtx/downloads

This is where plugins may optionally cache downloaded assets such as tarballs. Use the always_keep_downloads setting to prevent rtx from removing files from here.

~/.local/share/rtx/plugins

rtx installs plugins to this directory when running rtx plugins install. If you are working on a plugin, I suggest symlinking it manually by running:

ln -s ~/src/rtx-my-tool ~/.local/share/rtx/plugins/my-tool

~/.local/share/rtx/installs

This is where tools are installed to when running rtx install. For example, rtx install [email protected] will install to ~/.local/share/rtx/installs/node/20.0.0

This will also create other symlinks to this directory for version prefixes ("20" and "20.15") and matching aliases ("lts", "latest"). For example:

20 -> ./20.15.0
20.15 -> ./20.15.0
latest -> ./20.15.0
lts -> ./20.15.0

~/.local/share/rtx/shims

This is where rtx places shims. Generally these are used for IDE integration or if rtx activate does not work for some reason.

Templates

Warning

This functionality is experimental and may change in the future.

Templates are used in the following locations:

  • .tool-versions files
  • .rtx.toml files for most configuration
  • (Submit a ticket if you want to see it used elsewhere!)

The following context objects are available inside templates:

  • env: HashMap<String, String> – current environment variables
  • config_root: PathBuf – directory containing the .rtx.toml file

As well as these functions:

  • exec(command: &str) -> String – execute a command and return the output

Templates are parsed with tera—which is quite powerful. For example, this snippet will get the directory name of the project:

[env]
PROJECT_NAME = "{{config_root | split(pat='/') | last}}"

Here's another using exec():

[aliases]
current = "{{exec(command='node --version')}}"

[experimental] Config Environments

It's possible to have separate .rtx.toml files in the same directory for different environments like development and production. To enable, set experimental = true in ~/.config/rtx/config.toml, then set RTX_ENV to an environment like development or production. rtx will then look for a .rtx.{RTX_ENV}.toml file in the current directory.

rtx will also look for "local" files like .rtx.local.toml and .rtx.{RTX_ENV}.local.toml in the current directory. These are intended to not be committed to version control. (Add .rtx.local.toml and .rtx.*.local.toml to your .gitignore file.)

The priority of these files goes in this order (bottom overrides top):

  • .rtx.toml
  • .rtx.local.toml
  • .rtx.{RTX_ENV}.toml
  • .rtx.{RTX_ENV}.local.toml

Use rtx doctor to see which files are being used.

Note that currently modifying RTX_DEFAULT_CONFIG_FILENAME to something other than .rtx.toml will not work with this feature. For now, it will disable it entirely. This may change in the future.

IDE Integration

IDEs work better with shims than they do environment variable modifications. The simplest way is to add the rtx shim directory to PATH.

For IntelliJ and VSCode—and likely others, you can modify ~/.zprofile with the following:

export PATH="$HOME/.local/share/rtx/shims:$PATH"

This won't work for all of rtx's functionality. For example, arbitrary env vars in [env] will only be set if a shim is executed. For this we need tighter integration with the IDE and a custom plugin. If you feel ambitious, take a look at existing direnv extensions for your IDE and see if you can modify it to work for rtx. Direnv and rtx work similarly and there should be a direnv extension that can be used as a starting point.

Alternatively, you may be able to get tighter integration with a direnv extension and using the use_rtx direnv function.

Core Plugins

rtx comes with some plugins built into the CLI written in Rust. These are new and will improve over time. They can be easily overridden by installing a plugin with the same name, e.g.: rtx plugin install python https://github.com/asdf-community/asdf-python.

You can see the core plugins with rtx plugin ls --core.

FAQs

I don't want to put a .tool-versions file into my project since git shows it as an untracked file

You can make git ignore these files in 3 different ways:

  • Adding .tool-versions to project's .gitignore file. This has the downside that you need to commit the change to the ignore file.
  • Adding .tool-versions to project's .git/info/exclude. This file is local to your project so there is no need to commit it.
  • Adding .tool-versions to global gitignore (core.excludesFile). This will cause git to ignore .tool-versions files in all projects. You can explicitly add one to a project if needed with git add --force .tool-versions.

What is the difference between "nodejs" and "node" (or "golang" and "go")?

These are aliased. For example, rtx use [email protected] is the same as rtx install [email protected]. This means it is not possible to have these be different plugins.

This is for convenience so you don't need to remember which one is the "official" name. However if something with the aliasing is acting up, submit a ticket or just stick to using "node" and "go". Under the hood, when rtx reads a config file or takes CLI input it will swap out "nodejs" and "golang".

While this change is rolling out, there is some migration code that will move installs/plugins from the "nodejs" and "golang" directories to the new names. If this runs for you you'll see a message but it should not run again unless there is some kind of problem. In this case, it's probably easiest to just run rm -rf ~/.local/share/rtx/installs/{golang,nodejs} ~/.local/share/rtx/plugins/{golang,nodejs}.

Once most users have migrated over this migration code will be removed.

What does rtx activate do?

It registers a shell hook to run rtx hook-env every time the shell prompt is displayed. rtx hook-env checks the current env vars (most importantly PATH but there are others like GOROOT or JAVA_HOME for some tools) and adds/removes/updates the ones that have changed.

For example, if you cd into a different directory that has java 18 instead of java 17 specified, just before the next prompt is displayed the shell runs: eval "$(rtx hook-env)" which will execute something like this in the current shell session:

export JAVA_HOME=$HOME/.local/share/installs/java/18
export PATH=$HOME/.local/share/installs/java/18/bin:$PATH

In reality updating PATH is a bit more complex than that because it also needs to remove java-17, but you get the idea.

You may think that is excessive to run rtx hook-env every time the prompt is displayed and it should only run on cd, however there are plenty of situations where it needs to run without the directory changing, for example if .tool-versions or .rtx.toml was just edited in the current shell.

Because it runs on prompt display, if you attempt to use rtx activate in a non-interactive session (like a bash script), it will never call rtx hook-env and in effect will never modify PATH because it never displays a prompt. For this type of setup, you can either call rtx hook-env manually every time you wish to update PATH, or use shims instead (preferred). Or if you only need to use rtx for certain commands, just prefix the commands with rtx x --. For example, rtx x -- npm test or rtx x -- ./my_script.sh.

rtx hook-env will exit early in different situations if no changes have been made. This prevents adding latency to your shell prompt every time you run a command. You can run rtx hook-env yourself to see what it outputs, however it is likely nothing if you're in a shell that has already been activated.

rtx activate also creates a shell function (in most shells) called rtx. This is a trick that makes it possible for rtx shell and rtx deactivate to work without wrapping them in eval "$(rtx shell)".

rtx activate doesn't work in ~/.profile, ~/.bash_profile, ~/.zprofile

rtx activate should only be used in rc files. These are the interactive ones used when a real user is using the terminal. (As opposed to being executed by an IDE or something). The prompt isn't displayed in non-interactive environments so PATH won't be modified.

For non-interactive setups, consider using shims instead which will route calls to the correct directory by looking at PWD every time they're executed. You can also call rtx exec instead of expecting things to be directly on PATH. You can also run rtx env in a non-interactive shell, however that will only setup the global tools. It won't modify the environment variables when entering into a different project.

Also see the shebang example for a way to make scripts call rtx to get the runtime. That is another way to use rtx without activation.

rtx is failing or not working right

First try setting RTX_DEBUG=1 or RTX_TRACE=1 and see if that gives you more information. You can also set RTX_LOG_FILE_LEVEL=debug RTX_LOG_FILE=/path/to/logfile to write logs to a file.

If something is happening with the activate hook, you can try disabling it and calling eval "$(rtx hook-env)" manually. It can also be helpful to use rtx env which will just output environment variables that would be set. Also consider using shims which can be more compatible.

If runtime installation isn't working right, try using the --raw flag which will install things in series and connect stdin/stdout/stderr directly to the terminal. If a plugin is trying to interact with you for some reason this will make it work.

Of course check the version of rtx with rtx --version and make sure it is the latest. Use rtx self-update to update it. rtx cache clean can be used to wipe the internal cache and rtx implode can be used to remove everything except config.

Before submitting a ticket, it's a good idea to test what you were doing with asdf. That way we can rule out if the issue is with rtx or if it's with a particular plugin. For example, if rtx install python@latest doesn't work, try running asdf install python latest to see if it's an issue with asdf-python.

Lastly, there is rtx doctor which will show diagnostic information and any warnings about issues detected with your setup. If you submit a bug report, please include the output of rtx doctor.

Windows support?

This is something we'd like to add! jdx#66

It's not a near-term goal and it would require plugin modifications, but it should be feasible.

How do I use rtx with http proxies?

Short answer: just set http_proxy and https_proxy environment variables. These should be lowercase.

rtx doesn't really do anything with http itself. The only exception to that is checking for new versions and rtx self-update. It uses git to clone plugins and the plugins themselves generally will download files with curl or wget.

However this is really up to the plugin. If you're having a proxy-related issue installing something you should post an issue on the plugin's repository.

How do the shorthand plugin names map to repositories?

e.g.: how does rtx plugin install elixir know to fetch https://github.com/asdf-vm/asdf-elixir?

asdf maintains an index of shorthands that rtx uses as a base. This is regularly updated every time that rtx has a release. This repository is stored directly into the codebase here. The bottom of that file contains modifications that rtx makes on top of asdf.

Does "node@20" mean the newest available version of node?

It depends on the command. Normally, for most commands and inside of config files, "node@20" will point to the latest installed version of node-20.x. You can find this version by running rtx latest --installed node@20 or by seeing what the ~/.local/share/rtx/installs/node/20 symlink points to:

$ ls -l ~/.local/share/rtx/installs/node/20
[...] /home/jdx/.local/share/rtx/installs/node/20 -> node-v20.0.0-linux-x64

There are some exceptions to this, such as the following:

  • rtx install node@20
  • rtx latest node@20
  • rtx upgrade node@20

These will use the latest available version of node-20.x. This generally makes sense because you wouldn't want to install a version that is already installed.

How do I migrate from asdf?

First, just install rtx with rtx activate like in the getting started guide and remove asdf from your shell rc file.

Then you can just run rtx install in a directory with an asdf .tool-versions file and it will install the runtimes. You could attempt to avoid this by copying the internal directory from asdf over to rtx with cp -r ~/.asdf ~/.local/share/rtx. That should work because they use the same structure, however this isn't officially supported or regularly tested. Alternatively you can set RTX_DATA_DIR=~/.asdf and see what happens.

How compatible is rtx with asdf?

rtx should be able to read/install any .tool-versions file used by asdf. Any asdf plugin should be usable in rtx. The commands in rtx are slightly different, such as rtx install [email protected] vs asdf install node 20.0.0—this is done so multiple tools can be specified at once. However, asdf-style syntax is still supported: (rtx install node 20.0.0). This is the case for most commands, though the help for the command may say that asdf-style syntax is supported.

When in doubt, just try asdf syntax and see if it works. If it doesn't open a ticket. It may not be possible to support every command identically, but we should attempt to make things as consistent as possible.

This isn't important for usability reasons so much as making it so plugins continue to work that call asdf commands.

If you need to switch to/from asdf or work in a project with asdf users, you can set RTX_ASDF_COMPAT=1. That prevents rtx from writing .tool-versions files that will not be compatible with asdf. Also consider using .rtx.toml instead which won't conflict with asdf setups.

rtx isn't working when calling from tmux or another shell initialization script

rtx activate will not update PATH until the shell prompt is displayed. So if you need to access a tool provided by rtx before the prompt is displayed you must manually call hook-env:

eval "$(rtx activate bash)"
eval "$(rtx hook-env)"
python --version # will work only after calling hook-env explicitly

For more information, see What does rtx activate do?

How do I disable/force CLI color output?

rtx uses console.rs which honors the clicolors spec:

  • CLICOLOR != 0: ANSI colors are supported and should be used when the program isn’t piped.
  • CLICOLOR == 0: Don’t output ANSI color escape codes.
  • CLICOLOR_FORCE != 0: ANSI colors should be enabled no matter what.

Is rtx secure?

Not as much as it should be, though currently a bit more secure than asdf. Work will happen in this area as secure supply chains are incredibly important. See SECURITY.md for more information.

Comparison to asdf

rtx is mostly a clone of asdf, but there are notable areas where improvements have been made.

Performance

asdf made (what I consider) a poor design decision to use shims that go between a call to a runtime and the runtime itself. e.g.: when you call node it will call an asdf shim file ~/.asdf/shims/node, which then calls asdf exec, which then calls the correct version of node.

These shims have terrible performance, adding ~120ms to every runtime call. rtx does not use shims and instead updates PATH so that it doesn't have any overhead when simply calling binaries. These shims are the main reason that I wrote this. Note that in the demo GIF at the top of this README that rtx isn't actually used when calling node -v for this reason. The performance is identical to running node without using rtx.

I don't think it's possible for asdf to fix these issues. The author of asdf did a great writeup of performance problems. asdf is written in bash which certainly makes it challenging to be performant, however I think the real problem is the shim design. I don't think it's possible to fix that without a complete rewrite.

rtx does call an internal command rtx hook-env every time the directory has changed, but because it's written in Rust, this is very quick—taking ~10ms on my machine. 4ms if there are no changes, 14ms if it's a full reload.

tl;dr: asdf adds overhead (~120ms) when calling a runtime, rtx adds a small amount of overhead (~10ms) when the prompt loads.

Environment variables in rtx

asdf only helps manage runtime executables. However, some tools are managed via environment variables (notably Java which switches via JAVA_HOME). This isn't supported very well in asdf and requires a separate shell extension just to manage.

However asdf plugins have a bin/exec-env script that is used for exporting environment variables like JAVA_HOME. rtx simply exports the environment variables from the bin/exec-env script in the plugin but places them in the shell for all commands. In asdf it only exports those commands when the shim is called. This means if you call java it will set JAVA_HOME, but not if you call some Java tool like mvn.

This means we're just using the existing plugin script but because rtx doesn't use shims it can be used for more things. It would be trivial to make a plugin that exports arbitrary environment variables like dotenv or direnv.

UX

Some commands are the same in asdf but others have been changed. Everything that's possible in asdf should be possible in rtx but may use slightly different syntax. rtx has more forgiving commands, such as using fuzzy-matching, e.g.: rtx install node@20. While in asdf you can run asdf install node latest:20, you can't use latest:20 in a .tool-versions file or many other places. In rtx you can use fuzzy-matching everywhere.

asdf requires several steps to install a new runtime if the plugin isn't installed, e.g.:

asdf plugin add node
asdf install node latest:20
asdf local node latest:20

In rtx this can all be done in a single step to set the local runtime version. If the plugin and/or runtime needs to be installed it will prompt:

asciicast

I've found asdf to be particularly rigid and difficult to learn. It also made strange decisions like having asdf list all but asdf latest --all (why is one a flag and one a positional argument?). rtx makes heavy use of aliases so you don't need to remember if it's rtx plugin add node or rtx plugin install node. If I can guess what you meant, then I'll try to get rtx to respond in the right way.

That said, there are a lot of great things about asdf. It's the best multi-runtime manager out there and I've really been impressed with the plugin system. Most of the design decisions the authors made were very good. I really just have 2 complaints: the shims and the fact it's written in Bash.

CI/CD

Using rtx in CI/CD is a great way to synchronize tool versions for dev/build.

GitHub Actions

rtx is pretty easy to use without an action:

jobs:
  build:
    steps:
    - run: |
        curl https://rtx.pub/install.sh | sh
        echo "$HOME/.local/share/rtx/bin" >> $GITHUB_PATH
        echo "$HOME/.local/share/rtx/shims" >> $GITHUB_PATH

Or you can use the custom action jdx/rtx-action:

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: jdx/rtx-action@v1
      - run: node -v # will be the node version from `.rtx.toml`/`.tool-versions`

Shims

While the PATH design of rtx works great in most cases, there are some situations where shims are preferable. One example is when calling rtx binaries from an IDE.

To support this, rtx does have a shim dir that can be used. It's located at ~/.local/share/rtx/shims.

$ rtx i [email protected]
$ rtx reshim # may be required if new shims need to be created
$ ~/.local/share/rtx/shims/node -v
v20.0.0

direnv

direnv and rtx both manage environment variables based on directory. Because they both analyze the current environment variables before and after their respective "hook" commands are run, they can sometimes conflict with each other.

If you have an issue, it's likely to do with the ordering of PATH. This means it would really only be a problem if you were trying to manage the same tool with direnv and rtx. For example, you may use layout python in an .envrc but also be maintaining a .tool-versions file with python in it as well.

A more typical usage of direnv would be to set some arbitrary environment variables, or add unrelated binaries to PATH. In these cases, rtx will not interfere with direnv.

rtx inside of direnv (use rtx in .envrc)

If you do encounter issues with rtx activate, or just want to use direnv in an alternate way, this is a simpler setup that's less likely to cause issues—at the cost of functionality.

This may be required if you want to use direnv's layout python with rtx. Otherwise there are situations where rtx will override direnv's PATH. use rtx ensures that direnv always has control.

To do this, first use rtx to build a use_rtx function that you can use in .envrc files:

rtx direnv activate > ~/.config/direnv/lib/use_rtx.sh

Now in your .envrc file add the following:

use rtx

direnv will now call rtx to export its environment variables. You'll need to make sure to add use_rtx to all projects that use rtx (or use direnv's source_up to load it from a subdirectory). You can also add use rtx to ~/.config/direnv/direnvrc.

Note that in this method direnv typically won't know to refresh .tool-versions files unless they're at the same level as a .envrc file. You'll likely always want to have a .envrc file next to your .tool-versions for this reason. To make this a little easier to manage, I encourage not actually using .tool-versions at all, and instead setting environment variables entirely in .envrc:

export RTX_NODE_VERSION=20.0.0
export RTX_PYTHON_VERSION=3.11

Of course if you use rtx activate, then these steps won't have been necessary and you can use rtx as if direnv was not used.

If you continue to struggle, you can also try using the shims method.

Do you need direnv?

While making rtx compatible with direnv is, and will always be a major goal of this project, I also want rtx to be capable of replacing direnv if needed. This is why rtx includes support for managing env vars and virtualenv for python using .rtx.toml.

If you find you continue to need direnv, please open an issue and let me know what it is to see if it's something rtx could support. rtx will never be as capable as direnv with a DSL like .envrc, but I think we can handle enough common use cases to make that unnecessary for most people.

Cache Behavior

rtx makes use of caching in many places in order to be efficient. The details about how long to keep cache for should eventually all be configurable. There may be gaps in the current behavior where things are hardcoded, but I'm happy to add more settings to cover whatever config is needed.

Below I explain the behavior it uses around caching. If you're seeing behavior where things don't appear to be updating, this is a good place to start.

Plugin/Runtime Cache

Each plugin has a cache that's stored in ~/$RTX_CACHE_DIR/<PLUGIN>. It stores the list of versions available for that plugin (rtx ls-remote <PLUGIN>), the legacy filenames (see below), the list of aliases, the bin directories within each runtime installation, and the result of running exec-env after the runtime was installed.

Remote versions are updated daily by default. The file is zlib messagepack, if you want to view it you can run the following (requires msgpack-cli).

cat ~/$RTX_CACHE_DIR/node/remote_versions.msgpack.z | perl -e 'use Compress::Raw::Zlib;my $d=new Compress::Raw::Zlib::Inflate();my $o;undef $/;$d->inflate(<>,$o);print $o;' | msgpack-cli decode

Note that the caching of exec-env may be problematic if the script isn't simply exporting static values. The vast majority of exec-env scripts only export static values, but if you're working with a plugin that has a dynamic exec-env submit a ticket and we can try to figure out what to do.

Caching exec-env massively improved the performance of rtx since it requires calling bash every time rtx is initialized. Ideally, we can keep this behavior.

Commands

rtx activate [OPTIONS] [SHELL_TYPE]

Initializes rtx in the current shell

This should go into your shell's rc file.
Otherwise, it will only take effect in the current session.
(e.g. ~/.zshrc, ~/.bashrc)

This is only intended to be used in interactive sessions, not scripts.
rtx is only capable of updating PATH when the prompt is displayed to the user.
For non-interactive use-cases, use shims instead.

Typically this can be added with something like the following:

    echo 'eval "$(rtx activate)"' >> ~/.zshrc

However, this requires that "rtx" is in your PATH. If it is not, you need to
specify the full path like this:

    echo 'eval "$(/path/to/rtx activate)"' >> ~/.zshrc

Usage: activate [OPTIONS] [SHELL_TYPE]

Arguments:
  [SHELL_TYPE]
          Shell type to generate the script for

          [possible values: bash, fish, nu, xonsh, zsh]

Options:
      --status
          Show "rtx: <PLUGIN>@<VERSION>" message when changing directories

Examples:
  $ eval "$(rtx activate bash)"
  $ eval "$(rtx activate zsh)"
  $ rtx activate fish | source
  $ execx($(rtx activate xonsh))

rtx alias get <PLUGIN> <ALIAS>

Show an alias for a plugin

This is the contents of an alias.<PLUGIN> entry in ~/.config/rtx/config.toml

Usage: alias get <PLUGIN> <ALIAS>

Arguments:
  <PLUGIN>
          The plugin to show the alias for

  <ALIAS>
          The alias to show

Examples:
 $ rtx alias get node lts-hydrogen
 20.0.0

rtx alias ls [PLUGIN]

List aliases
Shows the aliases that can be specified.
These can come from user config or from plugins in `bin/list-aliases`.

For user config, aliases are defined like the following in `~/.config/rtx/config.toml`:

  [alias.node]
  lts = "20.0.0"

Usage: alias ls [PLUGIN]

Arguments:
  [PLUGIN]
          Show aliases for <PLUGIN>

Examples:
  $ rtx aliases
  node    lts-hydrogen   20.0.0

rtx alias set <PLUGIN> <ALIAS> <VALUE>

Add/update an alias for a plugin

This modifies the contents of ~/.config/rtx/config.toml

Usage: alias set <PLUGIN> <ALIAS> <VALUE>

Arguments:
  <PLUGIN>
          The plugin to set the alias for

  <ALIAS>
          The alias to set

  <VALUE>
          The value to set the alias to

Examples:
  $ rtx alias set node lts-hydrogen 18.0.0

rtx alias unset <PLUGIN> <ALIAS>

Clears an alias for a plugin

This modifies the contents of ~/.config/rtx/config.toml

Usage: alias unset <PLUGIN> <ALIAS>

Arguments:
  <PLUGIN>
          The plugin to remove the alias from

  <ALIAS>
          The alias to remove

Examples:
  $ rtx alias unset node lts-hydrogen

rtx bin-paths

List all the active runtime bin paths

Usage: bin-paths

rtx cache clear

Deletes all cache files in rtx

Usage: cache clear

rtx completion [SHELL]

Generate shell completions

Usage: completion [SHELL]

Arguments:
  [SHELL]
          Shell type to generate completions for

          [possible values: bash, fish, zsh]

Examples:
  $ rtx completion bash > /etc/bash_completion.d/rtx
  $ rtx completion zsh  > /usr/local/share/zsh/site-functions/_rtx
  $ rtx completion fish > ~/.config/fish/completions/rtx.fish

rtx current [PLUGIN]

Shows current active and installed runtime versions

This is similar to `rtx ls --current`, but this only shows the runtime
and/or version. It's designed to fit into scripts more easily.

Usage: current [PLUGIN]

Arguments:
  [PLUGIN]
          Plugin to show versions of e.g.: ruby, node

Examples:
  # outputs `.tool-versions` compatible format
  $ rtx current
  python 3.11.0 3.10.0
  shfmt 3.6.0
  shellcheck 0.9.0
  node 20.0.0

  $ rtx current node
  20.0.0

  # can output multiple versions
  $ rtx current python
  3.11.0 3.10.0

rtx deactivate

Disable rtx for current shell session

This can be used to temporarily disable rtx in a shell session.

Usage: deactivate

Examples:
  $ rtx deactivate bash
  $ rtx deactivate zsh
  $ rtx deactivate fish
  $ execx($(rtx deactivate xonsh))

rtx direnv activate

Output direnv function to use rtx inside direnv

See https://github.com/jdx/rtx#direnv for more information

Because this generates the legacy files based on currently installed plugins,
you should run this command after installing new plugins. Otherwise
direnv may not know to update environment variables when legacy file versions change.

Usage: direnv activate

Examples:
  $ rtx direnv activate > ~/.config/direnv/lib/use_rtx.sh
  $ echo 'use rtx' > .envrc
  $ direnv allow

rtx doctor

Check rtx installation for possible problems.

Usage: doctor

Examples:
  $ rtx doctor
  [WARN] plugin node is not installed

rtx env [OPTIONS] [TOOL@VERSION]...

Exports env vars to activate rtx a single time

Use this if you don't want to permanently install rtx. It's not necessary to
use this if you have `rtx activate` in your shell rc file.

Usage: env [OPTIONS] [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to use

Options:
  -s, --shell <SHELL>
          Shell type to generate environment variables for

          [possible values: bash, fish, nu, xonsh, zsh]

  -J, --json
          Output in JSON format

Examples:
  $ eval "$(rtx env -s bash)"
  $ eval "$(rtx env -s zsh)"
  $ rtx env -s fish | source
  $ execx($(rtx env -s xonsh))

rtx env-vars [OPTIONS] [ENV_VARS]...

Manage environment variables

By default this command modifies ".rtx.toml" in the current directory.
You can specify the file name by either setting the RTX_DEFAULT_CONFIG_FILENAME environment variable, or by using the --file option.

Usage: env-vars [OPTIONS] [ENV_VARS]...

Arguments:
  [ENV_VARS]...
          Environment variable(s) to set
          e.g.: NODE_ENV=production

Options:
      --file <FILE>
          The TOML file to update

          Defaults to RTX_DEFAULT_CONFIG_FILENAME environment variable, or ".rtx.toml".

      --remove <ENV_VAR>
          Remove the environment variable from config file

          Can be used multiple times.

rtx exec [OPTIONS] [TOOL@VERSION]... [-- <COMMAND>...]

Execute a command with tool(s) set

use this to avoid modifying the shell session or running ad-hoc commands with rtx tools set.

Tools will be loaded from .rtx.toml/.tool-versions, though they can be overridden with <RUNTIME> args
Note that only the plugin specified will be overridden, so if a `.tool-versions` file
includes "node 20" but you run `rtx exec [email protected]`; it will still load node@20.

The "--" separates runtimes from the commands to pass along to the subprocess.

Usage: exec [OPTIONS] [TOOL@VERSION]... [-- <COMMAND>...]

Arguments:
  [TOOL@VERSION]...
          Tool(s) to start e.g.: node@20 [email protected]

  [COMMAND]...
          Command string to execute (same as --command)

Options:
  -c, --command <C>
          Command string to execute

  -C, --cd <CD>
          Change to this directory before executing the command

Examples:
  $ rtx exec node@20 -- node ./app.js  # launch app.js using node-20.x
  $ rtx x node@20 -- node ./app.js     # shorter alias

  # Specify command as a string:
  $ rtx exec node@20 [email protected] --command "node -v && python -V"

  # Run a command in a different directory:
  $ rtx x -C /path/to/project node@20 -- node ./app.js

rtx implode [OPTIONS]

Removes rtx CLI and all related data

Skips config directory by default.

Usage: implode [OPTIONS]

Options:
      --config
          Also remove config directory

  -n, --dry-run
          List directories that would be removed without actually removing them

rtx install [OPTIONS] [TOOL@VERSION]...

Install a tool version

This will install a tool version to `~/.local/share/rtx/installs/<PLUGIN>/<VERSION>`
It won't be used simply by being installed, however.
For that, you must set up a `.rtx.toml`/`.tool-version` file manually or with `rtx use`.
Or you can call a tool version explicitly with `rtx exec <TOOL>@<VERSION> -- <COMMAND>`.

Tools will be installed in parallel. To disable, set `--jobs=1` or `RTX_JOBS=1`

Usage: install [OPTIONS] [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to install e.g.: node@20

Options:
  -f, --force
          Force reinstall even if already installed

  -v, --verbose...
          Show installation output

Examples:
  $ rtx install [email protected]  # install specific node version
  $ rtx install node@20      # install fuzzy node version
  $ rtx install node         # install version specified in .tool-versions or .rtx.toml
  $ rtx install                # installs everything specified in .tool-versions or .rtx.toml

rtx latest [OPTIONS] <TOOL@VERSION>

Gets the latest available version for a plugin

Usage: latest [OPTIONS] <TOOL@VERSION>

Arguments:
  <TOOL@VERSION>
          Tool to get the latest version of

Options:
  -i, --installed
          Show latest installed instead of available version

Examples:
  $ rtx latest node@20  # get the latest version of node 20
  20.0.0

  $ rtx latest node     # get the latest stable version of node
  20.0.0

rtx link [OPTIONS] <TOOL@VERSION> <PATH>

Symlinks a tool version into rtx

Use this for adding installs either custom compiled outside
rtx or built with a different tool.

Usage: link [OPTIONS] <TOOL@VERSION> <PATH>

Arguments:
  <TOOL@VERSION>
          Tool name and version to create a symlink for

  <PATH>
          The local path to the tool version
          e.g.: ~/.nvm/versions/node/v20.0.0

Options:
  -f, --force
          Overwrite an existing tool version if it exists

Examples:
  # build node-20.0.0 with node-build and link it into rtx
  $ node-build 20.0.0 ~/.nodes/20.0.0
  $ rtx link [email protected] ~/.nodes/20.0.0

  # have rtx use the python version provided by Homebrew
  $ brew install node
  $ rtx link node@brew $(brew --prefix node)
  $ rtx use node@brew

rtx ls [OPTIONS] [PLUGIN]

List installed and/or currently selected tool versions

Usage: ls [OPTIONS] [PLUGIN]

Arguments:
  [PLUGIN]
          Only show tool versions from [PLUGIN]

Options:
  -c, --current
          Only show tool versions currently specified in a .tool-versions/.rtx.toml

  -g, --global
          Only show tool versions currently specified in a the global .tool-versions/.rtx.toml

  -i, --installed
          Only show tool versions that are installed Hides missing ones defined in .tool-versions/.rtx.toml but not yet installed

  -J, --json
          Output in json format

  -m, --missing
          Display missing tool versions

      --prefix <PREFIX>
          Display versions matching this prefix

Examples:
  $ rtx ls
  node    20.0.0 ~/src/myapp/.tool-versions latest
  python  3.11.0 ~/.tool-versions           3.10
  python  3.10.0

  $ rtx ls --current
  node    20.0.0 ~/src/myapp/.tool-versions 20
  python  3.11.0 ~/.tool-versions           3.11.0

  $ rtx ls --json
  {
    "node": [
      {
        "version": "20.0.0",
        "install_path": "/Users/jdx/.rtx/installs/node/20.0.0",
        "source": {
          "type": ".rtx.toml",
          "path": "/Users/jdx/.rtx.toml"
        }
      }
    ],
    "python": [...]
  }

rtx ls-remote [OPTIONS] [TOOL@VERSION] [PREFIX]

List runtime versions available for install

note that the results are cached for 24 hours
run `rtx cache clean` to clear the cache and get fresh results

Usage: ls-remote [OPTIONS] [TOOL@VERSION] [PREFIX]

Arguments:
  [TOOL@VERSION]
          Plugin to get versions for

  [PREFIX]
          The version prefix to use when querying the latest version
          same as the first argument after the "@"

Options:
      --all
          Show all installed plugins and versions

Examples:
  $ rtx ls-remote node
  18.0.0
  20.0.0

  $ rtx ls-remote node@20
  20.0.0
  20.1.0

  $ rtx ls-remote node 20
  20.0.0
  20.1.0

rtx outdated [TOOL@VERSION]...

Shows outdated tool versions

Usage: outdated [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to show outdated versions for
          e.g.: node@20 [email protected]
          If not specified, all tools in global and local configs will be shown

Examples:
  $ rtx outdated
  Plugin  Requested  Current  Latest
  python  3.11       3.11.0   3.11.1
  node    20         20.0.0   20.1.0

  $ rtx outdated node
  Plugin  Requested  Current  Latest
  node    20         20.0.0   20.1.0

rtx plugins install [OPTIONS] [NEW_PLUGIN] [GIT_URL]

Install a plugin

note that rtx automatically can install plugins when you install a tool
e.g.: `rtx install node@20` will autoinstall the node plugin

This behavior can be modified in ~/.config/rtx/config.toml

Usage: plugins install [OPTIONS] [NEW_PLUGIN] [GIT_URL]

Arguments:
  [NEW_PLUGIN]
          The name of the plugin to install
          e.g.: node, ruby
          Can specify multiple plugins: `rtx plugins install node ruby python`

  [GIT_URL]
          The git url of the plugin

Options:
  -f, --force
          Reinstall even if plugin exists

  -a, --all
          Install all missing plugins
          This will only install plugins that have matching shorthands.
          i.e.: they don't need the full git repo url

  -v, --verbose...
          Show installation output

Examples:
  # install the node via shorthand
  $ rtx plugins install node

  # install the node plugin using a specific git url
  $ rtx plugins install node https://github.com/rtx-plugins/rtx-nodejs.git

  # install the node plugin using the git url only
  # (node is inferred from the url)
  $ rtx plugins install https://github.com/rtx-plugins/rtx-nodejs.git

  # install the node plugin using a specific ref
  $ rtx plugins install node https://github.com/rtx-plugins/rtx-nodejs.git#v1.0.0

rtx plugins link [OPTIONS] <NAME> [PATH]

Symlinks a plugin into rtx

This is used for developing a plugin.

Usage: plugins link [OPTIONS] <NAME> [PATH]

Arguments:
  <NAME>
          The name of the plugin
          e.g.: node, ruby

  [PATH]
          The local path to the plugin
          e.g.: ./rtx-node

Options:
  -f, --force
          Overwrite existing plugin

Examples:
  # essentially just `ln -s ./rtx-node ~/.local/share/rtx/plugins/node`
  $ rtx plugins link node ./rtx-node

  # infer plugin name as "node"
  $ rtx plugins link ./rtx-node

rtx plugins ls [OPTIONS]

List installed plugins

Can also show remotely available plugins to install.

Usage: plugins ls [OPTIONS]

Options:
  -c, --core
          The built-in plugins only
          Normally these are not shown

      --user
          List installed plugins

          This is the default behavior but can be used with --core
          to show core and user plugins

  -u, --urls
          Show the git url for each plugin
          e.g.: https://github.com/asdf-vm/asdf-node.git

      --refs
          Show the git refs for each plugin
          e.g.: main 1234abc

Examples:
  $ rtx plugins ls
  node
  ruby

  $ rtx plugins ls --urls
  node                        https://github.com/asdf-vm/asdf-node.git
  ruby                          https://github.com/asdf-vm/asdf-ruby.git

rtx plugins ls-remote [OPTIONS]

List all available remote plugins

The full list is here: https://github.com/jdx/rtx/blob/main/src/default_shorthands.rs

Examples:
  $ rtx plugins ls-remote


Usage: plugins ls-remote [OPTIONS]

Options:
  -u, --urls
          Show the git url for each plugin e.g.: https://github.com/rtx-plugins/rtx-nodejs.git

      --only-names
          Only show the name of each plugin by default it will show a "*" next to installed plugins

rtx plugins uninstall [OPTIONS] [PLUGIN]...

Removes a plugin

Usage: plugins uninstall [OPTIONS] [PLUGIN]...

Arguments:
  [PLUGIN]...
          Plugin(s) to remove

Options:
  -p, --purge
          Also remove the plugin's installs, downloads, and cache

  -a, --all
          Remove all plugins

Examples:
  $ rtx uninstall node

rtx plugins update [PLUGIN]...

Updates a plugin to the latest version

note: this updates the plugin itself, not the runtime versions

Usage: plugins update [PLUGIN]...

Arguments:
  [PLUGIN]...
          Plugin(s) to update

Examples:
  $ rtx plugins update            # update all plugins
  $ rtx plugins update node       # update only node
  $ rtx plugins update node#beta  # specify a ref

rtx prune [OPTIONS] [PLUGIN]...

Delete unused versions of tools

rtx tracks which config files have been used in ~/.local/share/rtx/tracked_config_files
Versions which are no longer the latest specified in any of those configs are deleted.
Versions installed only with environment variables (`RTX_<PLUGIN>_VERSION`) will be deleted,
as will versions only referenced on the command line (`rtx exec <PLUGIN>@<VERSION>`).

Usage: prune [OPTIONS] [PLUGIN]...

Arguments:
  [PLUGIN]...
          Prune only versions from these plugins

Options:
  -n, --dry-run
          Do not actually delete anything

Examples:
  $ rtx prune --dry-run
  rm -rf ~/.local/share/rtx/versions/node/20.0.0
  rm -rf ~/.local/share/rtx/versions/node/20.0.1

rtx reshim

rebuilds the shim farm

This creates new shims in ~/.local/share/rtx/shims for CLIs that have been added.
rtx will try to do this automatically for commands like `npm i -g` but there are
other ways to install things (like using yarn or pnpm for node) that rtx does
not know about and so it will be necessary to call this explicitly.

If you think rtx should automatically call this for a particular command, please
open an issue on the rtx repo. You can also setup a shell function to reshim
automatically (it's really fast so you don't need to worry about overhead):

npm() {
  command npm "$@"
  rtx reshim
}

Usage: reshim

Examples:
  $ rtx reshim
  $ ~/.local/share/rtx/shims/node -v
  v20.0.0

rtx self-update [OPTIONS] [VERSION]

Updates rtx itself

Uses the GitHub Releases API to find the latest release and binary
By default, this will also update any installed plugins

Usage: self-update [OPTIONS] [VERSION]

Arguments:
  [VERSION]
          Update to a specific version

Options:
  -f, --force
          Update even if already up to date

      --no-plugins
          Disable auto-updating plugins

  -y, --yes
          Skip confirmation prompt

rtx settings get <KEY>

Show a current setting

This is the contents of a single entry in ~/.config/rtx/config.toml

Note that aliases are also stored in this file
but managed separately with `rtx aliases get`

Usage: settings get <KEY>

Arguments:
  <KEY>
          The setting to show

Examples:
  $ rtx settings get legacy_version_file
  true

rtx settings ls

Show current settings

This is the contents of ~/.config/rtx/config.toml

Note that aliases are also stored in this file
but managed separately with `rtx aliases`

Usage: settings ls

Examples:
  $ rtx settings
  legacy_version_file = false

rtx settings set <KEY> <VALUE>

Add/update a setting

This modifies the contents of ~/.config/rtx/config.toml

Usage: settings set <KEY> <VALUE>

Arguments:
  <KEY>
          The setting to set

  <VALUE>
          The value to set

Examples:
  $ rtx settings set legacy_version_file true

rtx settings unset <KEY>

Clears a setting

This modifies the contents of ~/.config/rtx/config.toml

Usage: settings unset <KEY>

Arguments:
  <KEY>
          The setting to remove

Examples:
  $ rtx settings unset legacy_version_file

rtx shell [OPTIONS] [TOOL@VERSION]...

Sets a tool version for the current shell session

Only works in a session where rtx is already activated.

Usage: shell [OPTIONS] [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to use

Options:
  -u, --unset
          Removes a previously set version

Examples:
  $ rtx shell node@20
  $ node -v
  v20.0.0

rtx sync node <--brew|--nvm|--nodenv>

Symlinks all tool versions from an external tool into rtx

For example, use this to import all Homebrew node installs into rtx

Usage: sync node <--brew|--nvm|--nodenv>

Options:
      --brew
          Get tool versions from Homebrew

      --nvm
          Get tool versions from nvm

      --nodenv
          Get tool versions from nodenv

Examples:
  $ brew install node@18 node@20
  $ rtx sync node --brew
  $ rtx use -g node@18 - uses Homebrew-provided node

rtx sync python --pyenv

Symlinks all tool versions from an external tool into rtx

For example, use this to import all pyenv installs into rtx

Usage: sync python --pyenv

Options:
      --pyenv
          Get tool versions from pyenv

Examples:
  $ pyenv install 3.11.0
  $ rtx sync python --pyenv
  $ rtx use -g [email protected] - uses pyenv-provided python

rtx trust [OPTIONS] [CONFIG_FILE]

Marks a config file as trusted

This means rtx will parse the file with potentially dangerous
features enabled.

This includes:
- environment variables
- templates
- `path:` plugin versions

Usage: trust [OPTIONS] [CONFIG_FILE]

Arguments:
  [CONFIG_FILE]
          The config file to trust

Options:
      --untrust
          No longer trust this config

Examples:
  # trusts ~/some_dir/.rtx.toml
  $ rtx trust ~/some_dir/.rtx.toml

  # trusts .rtx.toml in the current or parent directory
  $ rtx trust

rtx uninstall [OPTIONS] <TOOL@VERSION>...

Removes runtime versions

Usage: uninstall [OPTIONS] <TOOL@VERSION>...

Arguments:
  <TOOL@VERSION>...
          Tool(s) to remove

Options:
  -a, --all
          Delete all installed versions

  -n, --dry-run
          Do not actually delete anything

Examples:
  $ rtx uninstall [email protected] # will uninstall specific version
  $ rtx uninstall node        # will uninstall current node version
  $ rtx uninstall --all [email protected] # will uninstall all node versions

rtx upgrade [OPTIONS] [TOOL@VERSION]...

Upgrades outdated tool versions

Usage: upgrade [OPTIONS] [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to upgrade
          e.g.: node@20 [email protected]
          If not specified, all current tools will be upgraded

Options:
  -n, --dry-run
          Just print what would be done, don't actually do it

rtx use [OPTIONS] [TOOL@VERSION]...

Change the active version of a tool locally or globally.

This will install the tool if it is not already installed.
By default, this will use an `.rtx.toml` file in the current directory.
Use the --global flag to use the global config file instead.
This replaces asdf's `local` and `global` commands, however those are still available in rtx.

Usage: use [OPTIONS] [TOOL@VERSION]...

Arguments:
  [TOOL@VERSION]...
          Tool(s) to add to config file
          e.g.: node@20
          If no version is specified, it will default to @latest

Options:
      --pin
          Save exact version to config file
          e.g.: `rtx use --pin node@20` will save 20.0.0 as the version

          [env: RTX_ASDF_COMPAT=]

      --fuzzy
          Save fuzzy version to config file
          e.g.: `rtx use --fuzzy node@20` will save 20 as the version
          this is the default behavior unless RTX_ASDF_COMPAT=1

      --remove <TOOL>
          Remove the tool(s) from config file

  -g, --global
          Use the global config file (~/.config/rtx/config.toml) instead of the local one

  -e, --env <ENV>
          [experimental] Modify an environment-specific config file like .rtx.<env>.toml

  -p, --path <PATH>
          Specify a path to a config file or directory If a directory is specified, it will look for .rtx.toml (default) or .tool-versions

Examples:
  # set the current version of node to 20.x in .rtx.toml of current directory
  # will write the fuzzy version (e.g.: 20)
  $ rtx use node@20

  # set the current version of node to 20.x in ~/.config/rtx/config.toml
  # will write the precise version (e.g.: 20.0.0)
  $ rtx use -g --pin node@20

  # sets .rtx.local.toml (which is intended not to be committed to a project)
  $ rtx use --env local node@20

  # sets .rtx.staging.toml (which is used if RTX_ENV=staging)
  $ rtx use --env staging node@20

rtx version

Show rtx version

Usage: version

rtx where <TOOL@VERSION>

Display the installation path for a runtime

Must be installed.

Usage: where <TOOL@VERSION>

Arguments:
  <TOOL@VERSION>
          Tool(s) to look up
          e.g.: ruby@3
          if "@<PREFIX>" is specified, it will show the latest installed version
          that matches the prefix
          otherwise, it will show the current, active installed version

Examples:
  # Show the latest installed version of node
  # If it is is not installed, errors
  $ rtx where node@20
  /home/jdx/.local/share/rtx/installs/node/20.0.0

  # Show the current, active install directory of node
  # Errors if node is not referenced in any .tool-version file
  $ rtx where node
  /home/jdx/.local/share/rtx/installs/node/20.0.0

rtx which [OPTIONS] <BIN_NAME>

Shows the path that a bin name points to

Usage: which [OPTIONS] <BIN_NAME>

Arguments:
  <BIN_NAME>
          The bin name to look up

Options:
      --plugin
          Show the plugin name instead of the path

      --version
          Show the version instead of the path

  -t, --tool <TOOL@VERSION>
          Use a specific tool@version
          e.g.: `rtx which npm --tool=node@20`

Examples:
  $ rtx which node
  /home/username/.local/share/rtx/installs/node/20.0.0/bin/node
  $ rtx which node --plugin
  node
  $ rtx which node --version
  20.0.0

Footnotes

  1. Note that rtx does not modify "cd". It actually runs every time the prompt is displayed. See the FAQ. ↩ ↩2

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Runtime Executor (asdf-plugin compatible)

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