[CentOS] Determine next UID number

John Kennedy skebi69 at gmail.com
Wed Oct 13 16:47:45 EDT 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...
>
> --
> Bowie
>

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
gets truncated)...
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
John

-- 
 John Kennedy
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.centos.org/pipermail/centos/attachments/20101013/c836db28/attachment.html 


More information about the CentOS mailing list