Ever used the man command?
Gives you a manual for any command. Its pretty useful however sometimes they make no sense.

For example, using the same word you are trying to define.... in the definition. But yeah If you come across a good comprehensive book on UNIX command line or better yet the OSX's UNIXish command line let me know.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
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Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves