User and Permissions Management Commands

CommandAction
chmod permissions filenameChanges the access permissions on filename, using numeric or symbolic permissions codes. (See Chapter 13, “Users, Groups, and Permissions.”)
chown username filenameChanges the ownership of filename to the user username. (See Chapter 13.)
chgrp groupname filenameChanges the group ownership of filename to the group groupname. (See Chapter 13.)
passwdChanges your login password. The root user can specify a username after passwd to change the password of a particular user. (See Chapter 13.)
adduserRuns a script that adds a new user to the system. (See Chapter 13.)
rmuser usernameRuns a script that removes a user from the system. That user will no longer be able to log in to ...

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