A very primitive shell script process monitor.

sup.sh

#!/bin/sh
# sup.sh
# author: kyle isom <[email protected]>
#
# *extremely* primitive supervisor to ensure a daemon runs and stays running
# use it with crontab.
#
# this is an external supervisor to accompany the monitor python module I wrote
# that gets used in the code that's running.
# see https://github.com/kisom/pymods/blob/master/monitor.py

if [ "x$#" = "x0" ]; then
    target='/bin/sh ./the_universe.sh'
else
    target="$@"
fi

mailto="comma,separated,list,of,devs,and,admins,to,alert"

count=$(ps ax | grep "${target}" | grep -v $0 | grep -c -v 'grep')
if [ "x${count}" = "x0" ]; then
    echo "${target} not in ps list!" | mail -s "superviser alert!" ${mailto}
    exit 1
fi

exit 0