Invoking subshells from script does not work if run in background

I have a script running in background, like:

su - insite1 -c "invokeTest.sh" &

Now this script, invokeTest.sh has contents:

while [ 1 ]
do
  echo "Hello World from invokeTest" >> /tmp/invokeTest
  ( exec "/tmp/test.sh" )
done

Although it prints, “Hello World from invokeTest” it does not call test.sh.

My question: Is there any way to call test.sh in infinite while loop directly from su - insite1 -c" "so that we can totally skip invokeTest.sh itself (but test.sh needs to run in background”?

If no, how to make sure test.sh is called from invokeTest.sh?

Answer

To answer your question about running the command without a script, you can put any shell commands into the -c argument, including a while loop. So you can write:

su - insite1 -c 'while :; do echo "Hello World" >> /tmp/invokeTest; /tmp/test.sh; done' &