Clearing Your Print Queue with a Terminal command

If you need to clear your entire print queue in Mac OS X for whatever reason, there is a simple terminal command you can type to do the job.

Simply:

1. Launch Terminal
2. Type cancel -a -
3. Success!

All print jobs in the print queue should now be gone!

I have only tested this in Mac OS X 10.5 Leopard. I assume it will work in 10.4 Tiger as well. NOTE: this works for Mountain Lion as well. 

This should come in handy should you find your prints are backed up behind a lot of erroneous print jobs.

Reference:
http://chrisgonyea.com/archives/2008/05/26/clear-entire-print-queue-in-os-x-with-a-terminal-command/