System Administration

Execute command as an administrator (can be destructive/insecure. Use only for system administration tasks):
sudo command

Become system administrator:
sudo -s

Quit system administration:

Forgot to type sudo in front of a command and already hit enter? Repeat the last command using sudo:
sudo !!

Change privileges over file or directory (see man page for details.)
sudo chmod

Create a new user:
sudo adduser

Change user privileges (be very careful with this one):
sudo usermod

Delete user
sudo deluser

Print groups to which current user belongs:

Create a new group:
sudo groupadd

Change group privileges:

Delete group:

Temporarily become a different user:
su username

Print usernames of logged in users:


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