[CentOS] Determine next UID number
skebi69 at gmail.com
Wed Oct 13 20:47:45 UTC 2010
On Wed, Oct 13, 2010 at 16:40, Bowie Bailey <Bowie_Bailey at buc.com> wrote:
> On 10/13/2010 4:22 PM, Terry Polzin wrote:
> > On Wed, 2010-10-13 at 20:09 +0000, Joseph L. Casale wrote:
> >>> Is there an equivalent in CentOS?
> >> cat /etc/passwd |cut -d ":" -f 3 |sort -n NEXTUID=`expr $LASTUID + 1`
> >> ;)
> > LASTUID=`cat /etc/passwd |grep -v nologin|cut -d ":" -f 3 |sort -n |
> > tail -1`; NEXTUID=`expr $LASTUID + 1`; echo $NEXTUID
> That assumes the highest UID number has a login shell...
This also does not tell me how useradd knows that on this system at this
time the highest UID assigned to a user is 20015. It will assign 20016 to
the next user even though some dim bulb gave a use a UID of 4294967294 (how
the hell that user can log in with a UID out of range is beyond me unless it
I have been able to use things like these 2 examples (cat /etc/passwd | cut
-d: -f3 | sort -n | tail -2 | head -1 in this case) but I want to get the
next UID from the system not by parsing /etc/passwd
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