[unwind]

... and if you didn't get that "tac" is a command to reverse some text, then you need to realize that it's "cat" backwards.

I promise, if it weren't so annoyingly hard to implement, Linux would have command called nwodtuhs to turn the machine on. Those crazy geeks! :D

[csense]

My favorite backwards command is the 'sl' command. If you have a Debian/Ubuntu command line handy, sudo apt-get install sl