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Here are some additional useful linux tools that I have used this week.

Screen – Allows you to have a constant screen(s).  Useful when remotely connecting to a box. Now you don’t have to wait for a task to finish. SSH in start your task and log out. Reconnect with screen to the existing screen session. I use this when I have to run my website backup script.

See these fantastic sites for more information
http://www.cyberciti.biz/tips/linux-screen-command-howto.html
http://www.howtogeek.com/howto/ubuntu/keep-your-ssh-session-running-when-you-disconnect/

NGrep – Its Grep for network interfaces or dump files from tcpdump or wireshark etc.
http://ngrep.sourceforge.net/usage.html