Hello every one, I have read a little about SED and GREP but I do not know how to do this:

Using SED or GREP:

"reverse all three letter words"
"replace the last two digits in any string of digits by zeros (0)"
"remove lines that start and end with the same word"

and I have more like these but the book just explains the simple stuff.

Thanks in advance.

This looks like homework, so I'm not going to provide answers.
I do have some links to sed related pages, take a look there.

Sed Tutorials:
http://sed.sourceforge.net/grabbag/tutorials/

The Awful Truth about sed:
http://www.grymoire.com/Unix/Sed.html

sed.sf.net (looks a bit messy, but a lot of info):
http://sed.sourceforge.net/

I bet the answers to all sed related questions are there.

man grep will give you all the info you need for grep related things.

Hope this helps.

__________________

The dead stay dead and the living only wait to join them........

No is not homework. These are questions from past midterms where 30 became "C"s in one nasty curve.

Thanks for the links!!!

Is there a fast and dirty way to use all these commands.

Thanks!!!

The rule is:
(6) Do not post classroom or homework problems.

I don't see an exception for questions from past midterms.

"remove lines that start and end with the same word"
awk '$1 != $NF' yourFile > newFile

As you can see, these aren't necessarily "tough" examples.

You must've picked up a very general book if it doesn't talk about how to do if/else statements with awk and sed.