Bash script to continuously execute binary even the binary crashes

Question

I have two binary files that I need to run (e.g., hello1 and hello2 and the order has to be hello1 followed by hello2), but from time to time hello2 crashes and when it crashes I need to manually restart hello2. I want a Bash script to keep checking the status of hello1 and hello2 and if either of them crashes then I want to start hello1 and hello2.

On Linux is checking the PIDs of hello1 and hello2 the best way to do this?

chepner · Accepted Answer · 2021-10-04 14:36:42Z

4

Run the commands directly as the condition of an until loop.

while :; do
   until hello1; do :; done
   until hello2; do :; done
done

If you only need to run each command once, you can omit the enclosing while loop.

The : is a do-nothing command required by the syntax of the loop. All you really want is for the loop to exit once the command has a succesful exit status.

answered Oct 4, 2021 at 14:36

chepner

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