groupadd

Adds groups

groupdel

Deletes groups

groupmod

Modifies groups

groups

Identifies group membership

grpck

Checks the consistency of the /etc/group file

last

Provides a historical list of all system logins and logouts

newgrp

Changes the user's primary group membership

passwd

Changes user passwords

pwck

Checks the consistency of the /etc/passwd file

set

Sets shell variables in the C shell

setenv

Sets environment variables in the C shell

su

Enables you to switch users or assume a role

useradd

Adds users

userdel

Deletes users

usermod

Modifies users

who

Shows who is logged in to the system