Best Unix Tricks?
acg: On OS X pbcopy and pbpaste are useful for working with clipboard data.  Copy data from a web-page or whatever, manipulate it on the command-line to get what you want. Putting reasonably large files in the clipboard can be useful too.For example:  curl http://news.bbc.co.uk/ | pbcopy # copies a web-page to clipboard

Depending on what you are doing it can be very useful:  pbpaste | sort | pbcopy # sort the contents of the clipboard.

Another useful feature of OS X is open, which uses the finder to open a file:  open file.pdf

  open music.mp3