Welcome to the 
This portal talks about the command line interface also called the CLI. This portal can use technical language.
ShellCommands ( CategoryRedundant: merge ShellToolTricks, PrincipalCommands and coreutils)
Console - how to survive in a console ?
Zg2ShellStartup - Example of bash configuration
External links:
http://www.spack.org/wiki/InTheBeginningWasTheCommandLine - Tutorial
http://linux.org.mt/article/terminal - Terminal
http://linuxcommand.org/ - "...tired of changing your desktop themes. You keep seeing this "terminal" thing. Now what?"