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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Use last argument of last command
Bash shortcut to work with the last argument of your last command

Convert diff output to HTML ins/del

Mutt - Change mail sender.

Prepend a text to a file.
Prepend text to a file. It doen't need temporary files, ed or sed.

Create a video screencast (capture screen) of screen portion, with audio (the audio you hear, not your mic)
Errors in output don't matter. Stop recording: ctrl-c. Result playable with Flash too. IMPORTANT: Find a Pulse Audio device to capture from: pactl list | grep -A2 'Source #' | grep 'Name: ' | cut -d" " -f2

Run bash on top of a vi session (saved or not saved), run multiple commands, instead of one at a time with :!(bashcommand), type exit and [enter] to get back to where you left off in vi.

Load file into RAM (cache) for faster accessing for repeated usage
Best result when file size less than half of RAM size

Check a server is up. If it isn't mail me.
This version uses netcat to check a particular service.

Verify if user account exists in Linux / Unix

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

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Follow the Tweets.

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