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tricks.md

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Spell book

Various tricks, snippets, commands for doing things.

Check what package a file belongs to

pacman -Qo

Show value of an option in Tmux

:show -A <option name> More info

Adding a program to autostart

Find it's .desktop file (pacman -Fl caffeine-ng | grep .desktop) and copy it ~/.config/autostart.

Filesystem management

setup LUKS1-type partition sudo cryptsetup luksFormat --type luks1 /dev/drive

backup LUKS headers sudo cryptsetup luksHeaderBackup --header-backup-file backup-location /dev/nvme0n1p5

closing LVM and LUKS container sudo vgchange -a n vg0 && sudo cryptsetup close cryptdisk

LVM: resize a filesystem

  • sudo lvm lvscan to get the volumes, let's say it's /dev/data/root
  • sudo e2fsck -f /dev/data/root
  • sudo resize2fs -P /dev/data/root 75G (last bit is the size)

Shrink LVM container inside a LUKS container https://wiki.archlinux.org/title/Resizing_LVM-on-LUKS#Resize_LVM_physical_Volume

  • [find $LV and $VG]
  • sudo lvs

  • the units here are gibibytes!

  • sudo lvresize -L 68G --resizefs $VG/$LV

  • [optionally] defragment the PV: https://unix.stackexchange.com/a/193971

  • TODO maybe a reload is needed here? sudo lvm pvscan shows nice values

  • sudo pvdisplay <opened luks partition, e.g. "/dev/mapper/crypt_pop_os">
  • NEW_VOLUME_BYTES = 4* PE_SIZE * TOTAL_PE + UNUSABLE_SIZE

  • if shrinking, calculate the size you want in mebibytes (this is safe, won't let you go below what's taken)

  • sudo pvresize --setphysicalvolumesize 69619M

  • get luks sector size

  • sudo cryptsetup status crypt_pop_os

  • figure out the bytes to give to cryptsetup

  • sudo pvdisplay /dev/mapper/crypt_pop_os
  • NEW_LUKS_SECTOR_COUNT = TOTAL PE * PE Size [BYTES] / LUKS_SECTOR_SIZE [BYTES]

  • close the LVM

  • sudo vgchange -a n data

  • change the LUKS sector count

  • sudo cryptsetup -b $NEW_LUKS_SECTOR_COUNT resize crypt_pop_os

  • closing the luks container

  • sudo cryptsetup close crypt_pop_os

  • resize partition

  • sudo parted /dev/nvme0n1

    unit s p[rint]

    sectors are NEW_LUKS_SECTOR_COUNT + offset sectors from "cryptsetup status"

    NEW_PARTITION_SECTOR_END = PARTITION_SECTOR_START + NEW_LUKS_SECTOR_COUNT - 1

    resizepart 3 NEW_PARTITION_SECTOR_END

Move a partition (100 MiB backwards) echo '+100M,' | sudo sfdisk --move-data /dev/nvme0n1 -N 3

Grow partition to take up the unallocated space after it echo ", +" | ./sfdisk -N 1 /dev/sdc

Convert a set of images into a PDF

convert <image paths> output.pdf convert is part of imagemagick

Check open ports / sockets

ss

iptables, IP forwarding

nftables

WiFi CLI

iw

Drive diagnostics

sudo smartctl -a <drive device>

Enabling Toggl Track integration with Trello, Gitlab, Github

Has to be done for every synced Brave instance, it seems. Toggl extension installed in the browser as an extension. Open extension settings for Toggl, enable Trello, Gitlab, Github.

EFI boot management

efibootmgr -v - show boot options sudo efibootmgr --delete-bootnum --bootnum 0000 - removing a boot option