Unix Tip: THE NEXT UID

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 3014 - May 8, 2010

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

THE NEXT UID

Here is one way to find out the next available UID on a system.

It takes both the password and group files and finds the next available UID and displays it.

(No cats were harmed in the making of this script)

#!/bin/bash
awk -F":" '{ print $3 }' /etc/passwd > number_list
awk -F":" '{ print $3 }' /etc/group >> number_list
A=` sort -g number_list | tail -1`
A=`expr $A + 1`
echo "New Available UID is $A"

--------------------------------------------------------------------------
To Subscribe: http://www.ugu.com/sui/ugu/show?tip.subscribe
To Unsubscribe: http://www.ugu.com/sui/ugu/show?tip.unsubscribe
To Submit A Tip: http://www.ugu.com/sui/ugu/show?tip.today

==========================================================================
DISCLAIMER: All UNIX HOT TIPS ARE OWNED BY THE UNIX GURU UNIVERSE AND ARE
NOT TO BE SOLD, PRINTED OR USED WITHOUT THE WRITTEN CONSENT OF THE UNIX
GURU UNIVERSE. ALL TIPS ARE "USE AT YOUR OWN RISK". UGU ADVISES THAT
ALL TIPS BE TESTED IN A NON-PRODUCTION DEVELOPMENT ENVIRONMENT FIRST.

Unix Guru Universe - www.ugu.com - tips@ugu.com - Copyright 1994-2001
==========================================================================