SHELL Command works fine as a standalone command, but fails when put into a shell script?

Android 8.1 PIXEL 2 with root access. I have seen this asked here once before but the only solution didn't help me at all. I am going to try and make this as simple as I can for the example. If I run the following command in terminal emulator or adb shell: am force-stop com.myapp.frustrated It will quit the app just fine. But when I run it in this shell script: #!/bin/sh am force-stop com.myapp.frustrated Nothing happens. It is odd to me that I can do many other commands just fine in a script, but a handful of them do not work. Any suggestions you have are much appreciated.