Distinguishing CLI from GUI

Björnke von Gierke bvg at mac.com
Mon Jun 13 08:47:42 EDT 2011


On 13 Jun 2011, at 14:41, Richard Gaskin wrote:

> As Todd Geist quoted here earlier, in the Dictionary entry for "$" it says:
>    If you start up the application from the command line (on OS X,
>    Unix or Windows systems), the command name is stored in the
>    global variable $0 and any arguments passed on the command line
>    are stored in numbered variables starting with the $ character.
>    For example, if you start the application by typing the following
>    shell command:
>      myrevapp -h name
>    then the global variable $0 contains "myrevapp" (the name of the
>    application), $1 contains "-h", and $2 contains "name".
> In my tests here, it seems this is only partially correct:  $0 contains the app name from the command line ("myrevapp" in their example), but $1 contains the "name" portion after the "-h" option flag, and the flag itself does not appear in any $ variable.
> I have an app in which I'd like to have two different behaviors, depending on whether it's being run from the command-line or as a GUI.
> This would be easy if the engine worked as described in the Dictionary so I could easily detect if the user launched it with "-ui", but it seems the option flags are not being passed to the application, though everything that doesn't begin with "-" is.
> So my question is two-fold:
> 1. I've tested this on Windows and Linux and get identical behavior, in which the "-" flags aren't present in the "$" vars.  Can anyone here confirm this on Linux, Win, or OS X?
> 2. If this is indeed a documentation bug and what I see in my tests is what happens for everyone, how can I determine whether the app was launched with "-ui" or not?
> --
> Richard Gaskin
> Fourth World
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