[CentOS] Slightly OT: check creation of a group

Laurent Wandrebeck l.wandrebeck at gmail.com
Mon Mar 1 16:08:16 UTC 2010


2010/3/1 Niki Kovacs <contact at kikinovak.net>:
> Hi,
>
> I'm currently writing an install script for an application, and my
> already limited Bash skills are a bit rusty.
>
> I want to check if a group exists, and if it doesn't, then create it.
>
> Only thing I found is:
>
> if [ grep medintux /etc/group ]; then
>        continue
> else
>        groupadd medintux
> fi
>
> Apparently I can't seem to "negate" the test, e. g. something like
>
> if !(grep medintux /etc/group)
>
> Any suggestions for the correct syntax here ?
>
> Thanks,
>
> Niki
Why don't you use groupadd -f ? It will not override the group if it
already exists, and shortens the code :)

Laurent


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