Launch a sh program at startup attached to a terminal window
Your use case is simple enough to just save your script to a file named with the .command file extension so that Terminal.app is chosen to open it. It needs to be user executable as well. Simply add that file to the user's Login Items in System Preferences.

The script is invoked with  an ; exit tacked on to the end so you can see and copy the results before dismissing that window each time you login.