The ShellShock bug shakes the Linux / Unix world and OSX. All of which can use the command interpreter Bash is now potentially affected. The easiest way to protect themselves is to implement as soon as possible the publishers updates. However, how to check the effectiveness?

There are some tests available today that are popping up all over the Web. But it's impossible to sort them all, because for many, the lines of code are not available. Besides a single line of code can be very useful, and very easy to use:

x='() { :;}; echo NOT_PATCHED' bash -c :

On an unpatched system, the result will be "NOT_PATCHED". The result is final, and shall trigger in shortly update the system.