some good Unix command reading

50 Most Frequently Used UNIX / Linux Commands (With Examples)

http://www.thegeekstuff.com/2010/11/50-linux-commands/

Unix Sed Tutorial: Printing File Lines using Address and Patterns

http://www.thegeekstuff.com/2009/09/unix-sed-tutorial-printing-file-lines-using-address-and-patterns/

UNIX tips: Learn 10 good UNIX usage habits

http://www.ibm.com/developerworks/aix/library/au-badunixhabits.html

4 Awk If Statement Examples ( if, if else, if else if, :? )

http://www.thegeekstuff.com/2010/02/awk-conditional-statements/