AWK is awesome! or I should say linux is awesome!
I had a post for linux one-liners here useful unix one liners for bioinformatics
Today, I came across a blog series about GTF file manipulation using AWK. I feel it is cool, it teaches awk using a practical example. you will see the beauty of linux commands!
here are the links:
http://reasoniamhere.com/2013/09/16/awk-gtf-how-to-analyze-a-transcriptome-like-a-pro-part-1/
http://reasoniamhere.com/2013/09/17/awk-gtf-how-to-analyze-a-transcriptome-like-a-pro-part-2/
http://reasoniamhere.com/2013/09/18/awk-gtf-how-to-analyze-a-transcriptome-like-a-pro-part-3/
Enjoy!