Aakhsyan webpage explain commonly used sed and awk for bioinformatics at
http://raunakms.wordpress.com/2013/06/08/sed-and-awk-for-bioinformatics/
Handy OneLiner at http://bioinformatics.whatheblog.com/2010/03/handy-one-liners-awk/
BioUnix...
This MIT wiki page demonstration shows how to perform some basic bioinformatics tasks using simple UNIX commands.
http://rous.mit.edu/index.php/Unix_commands_applied_to_bioinformatics