[jpollock]

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)

[Bender]

otherwise it gives you manly men

That's only just after midnight [1][2]

[1] - https://www.youtube.com/watch?v=XEjLoHdbVeE

[2] - https://unix.stackexchange.com/questions/405783/why-does-man...

[ifh-hn]

I love that this situation occured.

[trashb]

you may also consider gnu info

  info dup