8. Users and groups

8.1. Paths

Table 8.1. User, Password and Groups
Command	Type	Description
`addgroup`		add a user or group to the system
`adduser`		add a user or group to the system
`chgpasswd`		update group passwords in batch mode
`chpasswd`		update passwords in batch mode
`delgroup`		remove a user or group from the system
`deluser`		remove a user or group from the system
`groupadd`		create a new group
`groupdel`		delete a group
`groupmod`		modify a group definition on the system
`groups`		print the groups a user is in
`id`		print real and effective user and group IDs
`last`		show a listing of last logged in users
`login`		begin session on the system
`login`		write utmp and wtmp entries
`logname`		print user's login name
`logout`		write utmp and wtmp entries
`nologin`		prevent unprivileged users from logging into the system
`nologin`		politely refuse a login
`passwd`		change user password
`passwd`		the password file
`su`		run a command with substitute user and group ID
`sudo`		execute a command as another user
`useradd`		create a new user or update default new user information
`userdel`		delete a user account and related files
`usermod`		modify a user account
`users`		print the user names of users currently logged in to the current host
`visudo`		edit the sudoers file
`w`		Show who is logged on and what they are doing.
`who`		show who is logged on
`whoami`		print effective userid
`ulimit`		get and set user limits
`mesg`		display (or do not display) messages from other users
`wall`		write a message to all users
`write`		send a message to another user