How do I write a bash script to restart a process if it dies?

Question

I have a python script that\'ll be checking a queue and performing an action on each item:

# checkqueue.py
while True:
  check_queue()
  do_something()
         


        

Answer 1

if ! test -f $PIDFILE || ! psgrep `cat $PIDFILE`; then
    restart_process
    # Write PIDFILE
    echo $! >$PIDFILE
fi