Published at LXer:

One can never say it enough: the terminal is a very powerful tool, and is probably the most interesting part in Unix. Among the plethora of useful commands and scripts that you can use, some seem less practical, if not completely useless. I’ve selected for you a couple of commands that are useless because they are funny, but not funny because they are useless (or maybe the other way around for some). If you are searching for ASCII art, random math curiosities, or various (in)utilities, this is the best of the useless.

Read More...

Instead of 'time cat' you can use 'time read' and press Enter.

Also, rev is very useful, especially when dealing with data that is right formatted, like package names.

If you want a really odd command try 'tac'. I haven't found a use for that one.