manipulate GTF file with AWK

AWK is awesome! or I should say linux is awesome!
I had a post for linux one-liners here  http://crazyhottommy.blogspot.com/2013/10/useful-unix-one-liner-for-bioinformatics.html

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!