System

Display kernel version

uname -r

Display long kernel version

uname -a

Report file system disk space usage

df [/] [/home]
sudo btrfs filesystem usage -h [/]

Display system tasks

top
htop

Display system information

inxi --admin --verbosity=7 --filter --width

Display a tree of processes

pstree

Switch to tty

    Ctrl+Alt+F1
    Ctrl+Alt+F2
    Ctrl+Alt+F3
    Ctrl+Alt+F4
    Ctrl+Alt+F5
    Ctrl+Alt+F6

Switch to the X session

Ctrl+Alt+F7

Start a unit

systemctl start unit

Stop a unit

systemctl stop unit

Check status of a unit

systemctl status unit

Enable a unit

systemctl enable unit

Disable a unit

systemctl disable unit

Restart a unit

systemctl restart unit

Shut down the system

poweroff

Restart the system

reboot