From: Jacob Fugal <lukfugl@...>
Date: 2005-09-10T04:04:16+09:00
Subject: Re: [QUIZ] NDiff (#46)

On 9/9/05, Jim Freeze <jim@freeze.org> wrote:
> Hi
> 
> To help the quiz writers focus on the 'the quiz' and not the administrative
> part of the code and to help promote CommandLine, here is a little snippet
> that some may find useful to get started.
<snip>

Thanks, Jim! I'd actually been trying to use CommandLine::Application,
but was having some problems. Comparing what I had against this let me
see where my problems were.

> A little note, I did not understand "just exit code" for -q. What is
> '-q' supposed
> to do. No output at all?

Yes, as in "no output to STDOUT". But there is output: the exit code.
This is a common feature of many unix tools (e.g. diff[1], grep). It
allows the tool to be used in a boolean environment during shell
scripting. An exit code of 0 means there was no difference (within
tolerance), and a non-zero exit code means there was a difference.

Jacob Fugal