watcher.sh

#!/bin/bash

# Process watcher
# Watches for processes if they run, if not, launch them again

# chmod +x /path/to/your/project/watcher.sh
# crontab -e
# * * * * * /path/to/your/project/watcher.sh  # Schedules watcher to run every minute

# Define program to run
queue() {
  cd /path/to/your/project && php artisan queue:work & echo $! > /tmp/my_queue.pid
}

# If file not exists launch program (for the first time)
if [ ! -f /tmp/my_queue.pid ]
then
	queue;
fi


# Check if process with given ID (/tmp/my_queue.pid) is running
# If not, launch again
if [ ! -d /proc/$(</tmp/my_queue.pid) ]
then
	queue;  # launch script

	now=`date`;  # Store current date
	echo "$now - relaunching" >> /path/to/your/project/watcher.log  # Log date of re-run
fi