Here's a decent explanation of what's going on:
http://en.wikipedia.org/wiki/Glob_(programming)
And yes, this is a unix thing. The command shell will automatically
perform file name expansion on commands before the target program is even
invoked. For example, using an argument like "*.log" will expand the
argument into a list of file names that match that pattern, passed as
separate arguments. All of this takes place in the command shell before
the target program is invoked.
Rick
On Fri, Feb 28, 2014 at 1:31 PM, Staffan Tylen <staffan.ty...@gmail.com>wrote:
> Having very limited linux background I'm trying to understand this but I
> don't believe I do (nothing wrong with your explanation Mark, I'm just
> thick!). Well, you say that shell behaves differently but I guess this
> discussion only applies to linux or unix. Running this from a Windows
> prompt I see no such behaviour. But in linux, do the question mark(s) get
> passed to the rexx program (I didn't see any signs of that) or do they get
> eaten by the shell parser? Sorry for being a nut-case, I blame my parents :)
>
>
>
> On Fri, Feb 28, 2014 at 6:59 PM, Mark Miesfeld <miesf...@gmail.com> wrote:
>
>>
>> On Fri, Feb 28, 2014 at 9:53 AM, Mark Miesfeld <miesf...@gmail.com>wrote:
>>
>>>
>>> No statement in the Rexx program invokes the shell. It is this line:
>>>
>>> $rexx ~/rx/odd ?
>>>
>>> typed on the command line that <invokes> the shell. Although invokes is
>>> not really a good word. The shell has already been invoked and is sitting
>>> in a loop parsing stuff that is typed on the command line.
>>>
>>> The shell determines that odd is a file name and an executable file at
>>> that, uses the shebang line to determine the rexx executes the file. It
>>> then passes the file name and the command line arguments to rexx.
>>>
>>
>> Well, that's not really correct, I didn't read that closely enough. The
>> shell determines the first token on the command line is an executable file,
>> rexx, and expands the rest of the command line into arguments it passes to
>> rexx.
>>
>> --
>> Mark Miesfeld
>>
>>
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Network behavioral analysis & security monitoring. All-in-one tool.
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