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shell script problem



The folowing shell script is supposed to check whether pnserver is running and
if it isn't to restart it.  It resides in /usr/local/pnserver.  If I run it when
I'm in that directory it works fine, but if I'm in a different directory (e.g.
/root) it won't work.  Any idea what I'm doing wrong?

#!/bin/sh
numps=`ps xa | grep pnserver | wc -l`
if test $numps -lt "2"
then
        /usr/local/pnserver/bin/pnserver /usr/local/pnserver/server.cfg
fi

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