Linux Pocket Guide, 2nd Edition

User Account Management

useradd	Create an account.
userdel	Delete an account.
usermod	Modify an account.
passwd	Change a password.
chfn	Change a user’s personal information.
chsh	Change a user’s shell.

The installation process for your Linux distro undoubtedly prompted you to create a superuser account (root), and possibly also an ordinary user account (presumably for yourself). But you might want to create other accounts, too.

Creating users is an important job not to be taken lightly. Every account is a potential avenue for an intruder to enter your system, so every user should have a strong, hard-to-guess password.