Oron Peled wrote: > On יום שלישי, 19 ביולי 2016 15:23:25 IDT Matthew Miller wrote: > > ... > > I remember when this came up before but can't find it now. I think it > > was changed to 99 when UIDs went to 32 bit and it suddenly started > > being 65535 on some systems and 4294967295 on others. * I was trying to > > figure out why 99 was eventually chosen, but can't find it now. > > I believe the uid 99 come from trying not to overlap regular users. > Back then (end of 90's), regular users uid's were: > * On old RedHat Linux >= 500 > * On some other Linux systems >= 1000 > * On many legacy Unices >= 100 (except on Irix >= 1000) > > It was very common to have NFS mounted /home across all servers (with > different *NIX vendors/versions). > So '99' was the "last" uid that was assured not to collide with uid's of > regular users on NFS.
Solaris and IRIX used to have 60001 as nobody, *and* either -2 or 65534 as nobody, either under the same name (!!!) or some alternative similar to nfsnobody. I don't think you want to assume that code thinks the two users are really identical in practice or that it's safe to merge them, though. -- Steve -- Steven Bonneville <sbonn...@redhat.com> Technical Curriculum Architect Red Hat | Red Hat Training Phone: +1-612-638-0507 gpg: 1024D/221D06FF 68B1 3E66 A351 6485 B9AF 24D8 3DF5 B50B 221D 06FF -- devel mailing list devel@lists.fedoraproject.org https://lists.fedoraproject.org/admin/lists/devel@lists.fedoraproject.org
