For all UNIX systems (Mac OS X, Linux, and FreeBSD—which is what FreeNAS uses), permissions work in generally the same way. Each file and folder has an owner and a group assigned to it, which ...

I'm posting this here because OS X is my main unix system, though I also use some linux stuff (synology and a ubuntu virtual machine in my mac). I've dabbled with unix off and on for more than 20 ...