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Comment by ifh-hn

5 hours ago

Haha, I'm even more confused now. I have no idea what dup is...

There are a couple of ways to figure out.

open a terminal (OSX/Linux) and type:

    man dup

open a browser window and search for:

    man dup

Both will bring up the man page for the function call.

To get recursive, you can try:

    man man unix

(the unix is important, otherwise it gives you manly men)