Linux

CLI Tools

usermod

• Add user to a group

  usermod -aG group_name username

  OR

  usermod --append --groups agroup_name username

  Here: '-aG' stands for '--append' and '--groups'.

• Add user to multiple goups at once.

  usermod -aG admins,wheel,sudo vyogami

  Here: 'admins', 'wheel', 'sudo' are the name of the group and 'vyogami' is the name of the user. '-aG' stands for '--append' and '--groups'.

• change username

  usermod -l new_username old_username

  Here: '-l' stands for '--login'.

• change user shell

  usermod -s path/to/shell username

  Here: '-s' stands for '--shell'.

• change user home directory

  sudo usermod --move-home --home path/to/new_home username

  OR

  sudo usermod -m -d path/to/new_home username

  Here: '-l' stands for '--login'.

• change user shell

  usermod -s path/to/shell username

  Here: '-s' stands for '--shell'.

• Lock user's password

  usermod -L username

  Here: '-L' stands for '--lock'.

• Unlock user's password

  usermod -U username

  Here: '-L' stands for '--unlock'.

• Add expire date to user account

  usermod -e 2024-08-21 username

  Here: '-e' stands for '--expiredate'.

lscpu

• Display information about CPU architecture

  lscpu

• Display the CPU information in human readable format.

  lscpu -e

  Here: '-e' stands for '--extended'.

Problemo

Check battery health

upower -i /org/freedesktop/UPower/devices/battery_BAT0

Changing Default Editor in shell

To set Neovim as default editor, add the following line to the shell's startup file(.bashrc, .zshrc, config.fish):

• For zsh and bash

  export EDITOR=nvim

• For fish (~/.config/fish/config.fish):

  set -Ux EDITOR nvim

Special Case: visudo

sudo sanitizes environment variables, so the above method won't work for visudo. Use this command instead:

sudo EDITOR=nvim visudo

Alternatively, add the following line to the top of your /etc/sudoers file:

Defaults editor=/usr/bin/nvim