Chapter 4. Account Administration
Administering the human side of your network—the users
There is more to administration than making sure that the system itself is running properly. You must keep the users of the system running as well.
As you've probably discovered by now, user data and group information are stored in two files:
/etc/passwd file stores usernames, encrypted passwords, real names, and other user information. The
/etc/group file stores group information and lists the groups of which the user is a member.
There are several methods you can use to add a user. The first, and probably the most difficult, is to make an entry in the
/etc/passwd file (and
/etc/group, if necessary) for the new user. ...