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 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

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 ?

I'd do it like this:

grep medintux /etc/group if [ $? != 0 ]; then echo "Group not found" fi

--------------------------------- Geoff Galitz Blankenheim NRW, Germany http://www.galitz.org/ http://german-way.com/blog/

Niki wrote:

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

Why not if [ `grep -c medintux /etc/group` == 0 ]; then groupadd medintux fi

?

mark