Unix Tip: THE NEXT UID

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UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 2427 - August 24, 2005

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

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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"

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