Slightly OT: check creation of a group

[Niki Kovacs <contact@xxxxxxxxxxxxx>]

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
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