How to make a Mac OS X .app with a shell script?
Well, it's been years I use this simple trick to have bash scripts in application (and really really don't understand why all people try so complicated solutions as creating &quot;Contents&quot; folders, info.plist or use Automator or Platypus or so... ????).

Create a folder named &quot;YourApplication.app&quot;. It can be created at any location that is convenient to your usage. Though, the most OS compliant locations may be /Applications or your own ~/Applications folder.
Put your script file directly in this folder the way that suites you the best (Finder, terminal etc). The script must be executable of course (use chmod +x if you need). No need for other folders or file (until you need to call other scripts or executable from within your script of course) The trick is to name your script with exactly the same name as the application folder but without extension. In the case described here the script file must be named &quot;YourApplication&quot;.

That's all ! It works on Mac os x since Snow Leopard to Mavericks. If anybody can try on newer OS versions and tell me.
Note: The script must be at least 28 bytes in size, otherwise it will not execute. It may be padded with blank lines to achieve minimum size.
Also, the first line of the script must be a shebang; e.g. #!/bin/bash or #!/bin/perl.