[screen] - Access multiple separate terminal sessions inside a single terminal window or remote terminal session

Its very useful if we want to work in multiple system (office and home PC). We won't lose the shell session connection.

Ref:
http://www.rackaid.com/resources/linux-screen-tutorial-and-how-to/
http://en.wikipedia.org/wiki/GNU_Screen

awk - One of the best tools in linux

I was searching for a tool/command in linux to remove all the duplicate lines from a file without sort the lines. And i came across this link (see the link below)...Its really amazing. We can do lots and lots of things using awk. Its one of the mostpowerful tools for file/string processing. I hope it will be useful for most of the software developers and testers. One more good thing is that awk is available for windows too.

Link: http://kaneda.bohater.net/faq/awk1line.txt.
The latest version of this file is here.