Is setsid command missing on OS X?

Question

I mean I can't use it in bash, is it not available on OS X, or is it just missing on my Mac?

It's not a PATH variable issue, because I searched with find command, and there's no file named setsid on my Mac at all.

If it's missing on OS X, is there any alternative to it? Or if it's the case that I somehow deleted it accidentally, where can I find a copy of it?

Answer 1

use Brew:

brew install util-linux

Answer 2

Yes. /usr/bin/setsid is missing on Mac OS/X.

The OS interface is available, so based on the chapter 2 man page there may be some hope for porting the Linux source to Darwin.