A collection of linux related things that I either keep forgetting, or may forget in the future.

Linux-cheatsheet.md

Laptop Battery management

• tlp: power management
• tlp-stat -b: see supported battery features
• tlp setcharge: charge the battery to the specified amount

User management

• useradd -m <username>: create a new user and their home directory
• gpasswd -a <user> <group>: add a user to a group
• chsh -l list available shells
• chsh -s <bin> change default shell for current user

---

• su -l <user>: log in as <user>

Files

Permissions

r=4
w=2
x=1

Disk usage

• df -h: show disk usage in human-readable format
• du -hs <file>: show disk usage of a file or folder

Bash

• sh -c "echo hello\!": start a shell to execute a command.
• [ -z ${var+x} ] && echo "var unset": check if a variable is set using parameter expansion

GPG

• gpg --edit-key <user id>: key maintenance, including revoking and extending

Git

• git update-index --skip-worktree <file> to ignore changes to the specified file

Vim

• Ctrl+w <direction>: Switch to window pane
• Ctrl+w s: Split current window horizontally
• Ctrl+w v: Split current window vertically
• Ctrl+w Shift+T: Move split window to tab
• gt/gT: Navigate tabs
• Ctrl+v Shift+I Multi cursor insert

Standards

• .editorconfig: for consistent coding styles. See https://editorconfig.org/

Distribution specific

Arch Linux

• paccache -rk1: clean the pacman cache leaving only the most recently installed version
• paccache -ruk0: remove all uninstalled versions
• The paccache script is provided by pacman-controb

Services

Openvpn

TODO

Postfix

TODO

Dovecot

TODO