Basic OSX APP

I have a shell script that takes one parameter which is the name of the output file. It looks like this - $ mfoc -O [login to view URL] it also produces verbose output to the terminal I need an OSX app that prompts the user for a filename and then displays a 'start' button. The start button should run the shell script with the filename parameter and save the file on the desktop. The output of the script should be shown in a text area. Thats it. The reason for using an app and not just running the shell script is that the customer has no technical knowledge so opening a terminal window is not acceptable.