Linux Users

On a Linux system a user has a user name and he is a member of various groups.

Useful commands:

$ whoami → Print out the user name (effective userid).
$ groups → Display the group names the user belongs to.
$ id         → Print the real (numeric) and effective (name) id of the user.
$ passwd → With this command a user can change his password.

The Linux operating system is a multi user system. This means that multiple users can work on the system at the same time.

Useful commands:

$ groups user2 → Determine the groups of user2.
$ id user2         → Display the ids of user2.

$ last                 → Show a list of users who last logged in.
$ last -n 14     → Print the last 14 logins.

$ who                   → Print out the users which are logged in at the moment.

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