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UGU: Unix Guru Universe - Unix Tip #4420- April 18, 2025
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Unix Tip #4420- April 18, 2025
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"
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4419
- TRANSFERRING MULTIBYTE FILES
4418
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4417
- ALIAS YOUR CONNECTIVITY
4416
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4415
- IS YOUR HARDWARE GETTING STOLEN?
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