i need to build a bash script which display alias commands,controls commands that are renamed and make un-alias all commands that are shorter then 12 characters and show the new list.
thanks in advance

And your attempt and where you are stuck is where??

Indeed you should show us what you've got already.
At least show what you know.
Maybe add some pseudo code.

yes, i have seen that link and didn't find the solution there, that's why i'm asking myself now. I'm new in Linux area and i can't solve it. All i know is that when you want to see a list of aliases set up on your linux box, just type alias at the prompt..

Great...so back to the first reply you received: post what YOU have written/tried so far, and tell us where you're stuck. We are NOT going to write your scripts for you, but will be very happy to help you...but you have to show effort of your own, first. This is not the place to come for a handout...but if you do want someone to write your code for you, then post it in the LQ Job Marketplace (along with how much you're willing to PAY someone to do your work for you), and you'll find someone very quickly.

There are THOUSANDS of very easily found bash scripting tutorials, that the briefest of Google searches can lead you to. There is one in my posting signature, and many you can find with a search on this very site. ALL of which have sample code and explanations.