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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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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Setup a persistant SSH tunnel w/ pre-shared key authentication
This creates a persistent ssh -i /path/to/key -ND local-IP:PORT User@Server connection. You may have to install autossh. -f puts in daemon mode. if you are having trouble, try it without -f.

Find top 10 largest files in /var directory (subdirectories and hidden files included )
Same as above, but modified to show human readable output

rotate a one page pdf to 90 Degrees Clockwise
This can be taken from the pdftk docs http://www.pdflabs.com/docs/pdftk-man-page/ http://www.pdflabs.com/docs/pdftk-cli-examples/ , but the command examples are not simple.

Regnerate Exif thumbnail.
Regnerate Exif thumbnail.

Display the top ten running processes - sorted by memory usage
ps returns all running processes which are then sorted by the 4th field in numerical order and the top 10 are sent to STDOUT.

Console clock
You will see it on the corner of your running terminal.

Search some text from all files inside a directory

Currency Conversion
eg: currency_convert 1 usd inr

Find all files containing a word
This command will find all files recursively containing the phrase entered, represented here by "searchphrase". This particular command searches in all php files, but you could change that to just be html files or just log files etc.


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