[CentOS] Slightly OT: check creation of a group

[Ron Loftin]

On Mon, 2010-03-01 at 17:03 +0100, Niki Kovacs wrote:
> 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 ?
> 

Try this:

grep -q medintux /etc/group || groupadd medintux

> Thanks,
> 
> Niki
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-- 
Ron Loftin                      reloftin at twcny.rr.com

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