So you want to know a linux command?
Heres a list of 687 commands.
Go to:
http://www.oreillynet.com/linux/cmd/
Alphabetical Directory of Linux Commands
This directory of Linux commands is from Linux in a Nutshell, 5th Edition.
Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.