In this hour, you learn how to
Log in and log out of the system
Change passwords with passwd
Choose a memorable and secure password
Find out who the computer thinks you are
Find out who else is on the system
Find out what everyone is doing on the system
Check the current date and time
This hour introduces a lot of commands, so it's very important that you have a UNIX system available on which you can work through all examples. Most examples have been taken from a Sun workstation running Solaris, a variant of UNIX System V Release 4, and have been double-checked on a BSD-based system. Any variance between the two is noted, and if you have a UNIX system available, odds are good that it's based on either AT&T System V or Berkeley UNIX.