Command
Action
chmod permissions filename
Changes the access permissions on filename, using numeric or symbolic permissions codes. (See Chapter 13, "Users, Groups, and Permissions.")
chown username filename
Changes the ownership of filename to the user username. (See Chapter 13.)
chgrp groupname filename
Changes the group ownership of filename to the group groupname. (See Chapter 13.)
passwd
Changes your login password. The root user can specify a username after passwd to change the password of a particular user. (See Chapter 13.)
adduser
Runs a script that adds a new user to the system. (See Chapter 13.)
rmuser username
Runs a script that removes a user from the system. That user will no longer be able to log in to the system. (See Chapter 13.)
vipw
Allows you to edit the /etc/master.passwd file directly, and it updates the database upon exiting. (See Chapter 13.)