Unix Commands

I have learned several Unix commands. Some of my favorites where:

ls:
This lists the directories and files in a specified directory. It more or
less, shows me the thing under a specified folder, whether it be more folders or files.

rm "filename":
This command removes a specified file from a specified directory
with the correct file path or from within the directory I am in.

cd:
This command basically changes directory.

cal:
Produces a calendar. You may specify the year for the calendar simply by following the command with a year ie: cal 2007.

exit:
This command simply exits the remote system.

I hope this could be of some use to some beginner Unix users.