Skip to content

Latest commit

 

History

History
183 lines (137 loc) · 4.61 KB

UtilitiesUsed.md

File metadata and controls

183 lines (137 loc) · 4.61 KB

Utilities Used During the Experiment

Linux Commands

tee

Tee is used to write to a file as well as to the stdout. It can also be said that tee duplicates its input to multiple output.

grep

One of the most useful commands of linux imo. grep searches for PATTERN in each FILE. If no FILE is given, recursive searches examine the working directory, and nonrecursive searches read standard input. By default, grep prints the matching lines.

cscope

Pretty powerful tool for code navigation, specially when working with kernel code.

Linux Network Utilities

ss

ss is used to monitor the network statistics, giving more information about TCP than netstat.

Installing ss

Before installing ss, run this command to install a dependency. sudo apt install libmnl-dev. (This is not essentially a dependency, but is recommended for error support) To use a more recent ss, download version 4.17:

 wget https://mirrors.edge.kernel.org/pub/linux/utils/net/iproute2/iproute2-4.17.0.tar.gz
 $ tar -xzvf iproute2-4.17.0.tar.gz
 $ cd iproute2-4.17.0
 $ ./configure
 $ make
 $ sudo make install

When we ran it, we noticed that the version of `ss` installed system
wide was still the old one (which we could see from running `ss -v`),
suggesting a problem with the last step - so we ran

$ cd misc
$ sudo make install

We noticed that the terminal still uses the older version of ss. Please send a PR if you find a fix.

iperf

Installing the iperf3 from the source

NOTE: This has been taken from a blog, the link for which is given the resources section.

$ git clone https://github.com/esnet/iperf.git

In the iperf directory, execute the following commands

$ ./bootstrap.sh
$ ./configure
$ make
$ sudo make install
$ sudo ldconfig

This will install the iperf to your machine. You can check the version by the following command:

netem

netem allows to emulate network conditions similar to those of a wide-area networks. The main purpose for my usage of netem was to emulate packet loss and delay in the network conditions. The full documentation of the same can be found here

tbf
tc

Documentation Utilities

pandoc
beamer

Other Linux Utilities

screen
awk
sed

The must learn tool!

The power of $

Terminal Used

terminator

Terminator is a terminal which I liked for its split feature, both horizontally and vertically.

Some of the shortcuts for terminator are as follows:

  • Ctrl+D: Close the current terminal.
  • Ctrl+Shift+X: Toggle between maximize the current terminal and restore all the terminals.
  • Ctrl+Shift+E: Split the terminal vertically.
  • Ctrl+Shift+O: Split the terminal horizontally.

Shell Used

fish

fish is a user-friendly which I personally liked for its text completion feature which grows smarter the more you use it.

Note: You can change the default shell of your system by using the following command chsh -s <shell-name>. Here the shell name for me was fish.

Some tips

  • Some files require to be edited in the sudo mode.If you forgot to open the file using sudo in vim and started editing it, use the following command while saving your file to avoid any hassle:
:w !sudo tee %

and then exit the file.

  • If your ssh terminal is hung, press enter followed by ~ and .. It closes the ssh terminal and you can begin anew.

  • To know the terminal you are running the script in, use the following command:

readlink /proc/$$/exe

Please note the following command will not run if you are running the fish terminal. (Please note that the command was tested only on bash, zsh and fish, out of which it does not work with fish because $$ isn't supported in fish.)

  • Killing/Stopping a process running in background. As we know that using & after a command in unix makes a program run in the background. What if we wish to terminate the program. Following ways will help you do so: * Use the command fg to bring the process in foreground and then use the Ctrl+C as you would do to kill a normal process. * Use the command jobs to list all the jobs running in the background and then use kill %<job-num>. * Use the process id of the process to kill it using pkill. Now how will you find the process id. Following are the ways: * Use the command ps with grep. * Use the command pgrep

Resources: