How to run sh script automatically when booting

1. How to automatically run a sh script on boot in linux.
   For example , the second question is to automatically run /test.sh at boot . Is there any way to make sure that test.sh has run correctly?
2. To start running, just add it to rc.local, usually /etc/rc.d/rc.local and add the following line to it:
3. sh /path/to/test.sh

4. Use the linux global variable $? to determine whether to execute, such as
   if [$? eq 0]
       then

5.                 echo "succeed!"

        be

#modified some typo --update @22:48