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Pidfiles typicaly use a technique like this. Below is a bourne shell example from my backup script. The purpose is to prevent two backups from running at the same time.

# exclusion
pidfile=/tmp/backup.pid
if test -f $pidfile
then
    pid=`cat $pidfile`
    if kill -0 $pid
    then
        echo $0 running as $pid > STDERR
        exit 1
    fi
fi
echo $$ > $pidfile

You might get a failure if the process does not belong to you and you are not root. So kill -0 will fail, although the process exists: it just doesn't accept signals from you.

anselm@valefor[10003:1]% kill -0 17369
kill: kill 17369 failed: operation not permitted

I used the same technique from a ruby startup script to determine if a previous instance was still running, so that I could delete the PID files safely otherwise.