How to track the status of the script in the crone and restart it if necessary?

Question

linux

I have such an entry in the crown, but it constantly spawns scripts:

*/10 * * * * ps aux|grep my_script| grep -v grep || exec /home/my_script > /home/log.txt &";

How can I make it so that it is normally checked whether an instance of the script is running and, if necessary, run it?
pidof can't be used because machines often don't have it. The truth is pgrep. But I would like a solution through ps.

Answer 1

So, what's with the cron? You just specify the sh script to run in the crone. And in the script itself, already do the checks you want. You can write the pid of the running one to a file and look for such one among the running ones before starting. Or perhaps you can find it by name in the list of processes. In general, everything is in your hands.

Answer 2

You do not have the fact that the result of the pipe will be equal to non-zero, since this will be the return code of the last command in the pipe.
Try something like this:

*/10 * * * * [ "$(ps ax | grep my_script | grep -v grep)" == "" ] &&  /home/my_script > /home/log.txt &";

Answer 3

man lckdo

Answer 4

write a systemd service for my_script
then the state of the service can be viewed through simple console commands.
But it is more efficient to prescribe restarting the service in case of a crash.