How to run a shell script at startup

Question

On an Amazon S3 Linux instance, I have two scripts called start_my_app and stop_my_app which start and stop forever (which in turn runs my

Answer 1

For Debian 9 see https://askubuntu.com/questions/228304/how-do-i-run-a-script-at-start-up. It is helped me. Short version for Debian 9: add commands (as root) to /etc/rc.local

/path_to_file/filename.sh ||  exit 1   # Added by me
exit 0

Probably, /path_to_file/filename.sh should be executable (I think so).