zjat02@uunet.uu.net (Jon A. Tankersley) (04/25/89)
I was recently checking into setting up 'global' uids for my company, the
pitfalls and benefits thereof and I noticed some interesting things.
UID's under 250 are often 'pre-allocated' by vendors. And there are some
definite inconsistencies between UNIX versions. The list below is not
complete and some of the UID information was taken from systems that have
been running for a long time, and may have 'bogus' reserved UID numbers -
particularly HP and Ultrix. If anyone can fill in the blanks for the
other systems I'd be interested.
Big surprise: Look closely at SYS and BIN..... I wonder if OSF, UI, or
POSIX, or X/OPEN has considered anything here.
Followups have been directed to comp.std.unix.
(A) - Indicates Apollo
(S) - Indicates Sun
(S4) - Indicates SunOS 4.0
(SV) - Indicates AT&T System V R3.2
(DV) - Indicates DEC VMS system
(DU) - Indicates DEC Ultrix system
(H) - Indicates Hewlett-Packard HPUX system
(IA) - Indicates IBM RT AIX
bin - owner of binaries
daemon - background / automated task user
default - DEC VMS catchall userid and groupid
field - DEC field services
guest - guest account - really shouldn't be around
install - AT&T installation account? Software installation?
lp - line printer spooler ?
lan - network services ?
listen - network services ?
network - network services ?
news - USENET news id (owner of news files and programs)
nobody - NFS-mapped userid for root across NFS mounts
nogroup - NFS-mapped groupid for wheel/system across NFS mounts
nuucp - remote uucp userid (see below)
other - catchall group account (everyone in the BSD world)
operator - system operator (often root equivalent)
printq - special group for people to manipulate printer queues ?
root - SuperUser on UNIX
ris - DEC Remote Installation Services ?
staff - systems staff group
sys - owner of 'system' files
system - SuperUser on VMS files
uucp - UNIX-UNIX copy id for email and file transfer
user - catchall group account
usr - catchall group account
Reserved ID Numbers: Sorted by number
Userid Groupid ProjectID(A)
nobody(S) -2 nogroup(S) -2
root(S,A) 0 wheel(S,A) 0 wheel 0
field(DU) 0
system(IA,DU) 0
daemon(S,A) 1 daemon(S,A) 1 apollo 1
staff(IA) 1
netmail(IA) 1
manager(DV) 1
other(SV,H) 2
sys(S,A) 2 sys(S,A) 2
kmem(S4) 2
uucp(DU) 2
bin(SV,H,IA) 2 bin(SV,H,IA) 2
bin(S,A) 3 bin(S,A) 3
sys(SV,H,IA) 3 sys(SV,H,IA) 3
uucp(S,A) 4 uucp(S,A) 4
adm(SV,H,IA) 4 adm(SV,H,IA) 4
tty(S4) 4
manager(DV) 4
bin(DU) 4
operator(S) 5
uucp(SV,H) 5 uucp(SV,H) 5
news(S) 6 news(S) 6
tftpd(IA) 6
mail(A,SV,H,AI) 6
ingres(S) 7 ingres(S) 7
news(DU) 8 news(DU) 8
lp(H) 9
sccs(DU) 9
audit(S) 9
printq(IA) 9
nuucp(SV) 10
network(H) 10
lan(H) 11
staff(S,A) 10
ris(DU) 11 ris(DU) 10
news(H) 12
none(A) 12 none(A) 12 none 12
sys_person(A) 13 sys_proj(A) 13 sys_org 13
user(A) 14 locksmith(A) 14
admin(A) 15 login(A) 15
lp(A) 16 backup(A) 16
sys_admin(A) 17
server(A) 18
sys(A) 19
other(S) 20
operator(DU) 28
guest(DU) 31
listen(SV) 37
sync(SV) 67
lp(SV) 71
ingres(S) 74
guest(IA) 100 usr(IA) 100
install(SV) 101
default(DV) 200 default(DV) 200
ingres(DU) 274
-tank-
#include <std/disclaimer.h> /* nobody knows the trouble I .... */