You can run a shell script in infinite loop by using while loop.

#!/bin/bash
while true
do
	echo "Press CTRL+C to stop the script execution"
	# Enter your desired command in this block.
done

You can also do this using below inline command

while true; do echo 'Press CTRL+C to stop the script execution'; done

You can also run an infinite loop in the background

while /bin/true; do
    something_in_the_background
done &

Reference:
https://unix.stackexchange.com/questions/223778/how-to-run-an-infinite-loop-in-the-background

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