When you encounter a unix command and you don't know what it is you can try googling for man head or run "man head" on your unix box.

PS: My experience is to beware of using the unix command line tools on OSX. The cp command does not copy the filesystem meta-data associated with a file. This can make some quicktime video files impossible to play due to removing codec information.

In reply to Re: what is /usr/bin/head by superfrink
in thread what is /usr/bin/head by richill

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