rootninja

Got a process that you want to restart in a script but it doesn’t respond nicely?  Use the sleep command in your script and check its status after you start, stop, or kill it.  After incrementally backing off a few times, waiting longer and longer, I give up and exit with an error.  But you could come back later, or basically raise an exception by saving the value of “$?”. You can do this as you start a process and want to make sure it’s fully up and running before moving on because it dies sometimes unexpectedly.  There’s a ton of uses for sleep.

DAEMON=myapp
sudo /etc/rc.d/init.d/$DAEMON start
sleep 1
if [ `sudo ps -ef | grep -c $DAEMON` == "1" ]; then
sleep 2
if [ `sudo ps -ef | grep -c $DAEMON` == "1" ]; then
sleep 3
if [ `sudo ps -ef | grep -c $DAEMON` == "1" ]; then
sleep 3
if [ `sudo ps -ef | grep -c $DAEMON` == "1" ]; then
echo
echo “ERROR: $DAEMON did not restart.”
echo “Quitting Early!…”
exit 1
fi
fi
fi
fi

howto, processes, scripting, shell, sleep