When I first started playing round with OS X’s Terminal, I felt a little lost in all of the Unix commands. I mean, there’s so many, and they can be very hard to remember. So, I was very happy when I “stumbled upon” the Linux BASH command A-Z index (using the awesome Firefox extension, StumbleUpon). Now, while the site does say it’s the Linux BASH command A-Z index, all of the commands can be used in OS X’s Terminal, provided that you’re using bash as the shell (it’s set as the default). So, next time you think that the rm command is for renaming a file (for people who don’t know, rm deletes files without sending them to the Trash first), check out the BASH index.
Hmm... it's interesting that you didn't dig a bit deeper.
The site also offers an OS X version of command collection.
http://www.ss64.com/osx/index.html
Just a tidbit for you :-)
However note that the OSX list is for the tcsh shell which is the old default shell. Bash is the current default.