I've used Platypus successfully with Perl scripts. The problem is that Platypus won't provide me with an input method to supply my search query. Its only way of providing input to a script turned application is files dropped on the resulting application.
(Incidentally, Platypus complained about /bin/bash not being a valid interpreter, after adding a space after the '#!' it did no longer complain.)

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If you want input you probably need to go to applescript. Open a dialog and then use applescript to run the shell script.

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