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▲ jpollock 4 hours ago

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 4 hours ago | parent [-]

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...