Command – chmod

Changes mode or permissions of a file

Command – su

changes the current user to another user. doesn’t’ work other users are not defined

Command – sudo

does something as another usually superuser. requires password of the superuser

Command – chown

Changes owner of a file. requires set owner to exist

Command – passwd

changes password of current user. a new password must be set, current password cannot be used.

Command – ps

shows what processes are current active

Command – kill

kills the target process using the PID

Command – printenv



prints a list of current environment variables