Re: What are these groups for?
On Wed, Oct 02, 2002 at 12:21:04PM -0400, Joey Hess wrote:
> > bin:*:2:
> HELP: No files on my system are owned by user or group bin. What
> good are they? Historically they were probably the owners of
> binaries in /bin? It is not mentioned in the FHS, debian
> policy, or the changelogs of base-passwd or base-files.
Yes, bin is a group from the history of UNIX, and you are correct in its
use. I can't actually tell you why, but files in /usr/bin (and other bin
directories) were once commonly owned by user bin and group bin. I think
HP-UX and Solaris still do it that way, and the bin account's home
directory is /usr/bin (on those machines /bin is just a symlink to
/usr/bin). I vaguely remember reading that the bin user was sometimes
used to run daemons, too.
> > sys:*:3:
> HELP: As with bin, except I don't even know what it was good for
I can't give you a real reason on this either, but I do know that device
files under /dev are sometimes owned by group sys. I think some other
files are also commonly owned by root:sys, but off the top of my head I
don't remember what kind.