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

I'm not sure how portable it is across operating systems, but you might check if your system contains the 'run-one' command, i.e. "man run-one". Specifically, this set of commands includes 'run-one-constantly', which seems to be exactly what is needed.

From man page:

run-one-constantly COMMAND [ARGS]

Note: obviously this could be called from within your script, but also it removes the need for having a script at all.

Answer 2

Have a look at monit (http://mmonit.com/monit/). It handles start, stop and restart of your script and can do health checks plus restarts if necessary.

Or do a simple script:

while true
do
/your/script
sleep 1
done