From: "David A. Black" <dblack@...>
Date: 2004-02-04T21:35:53+09:00
Subject: Re: ARGV

Hi --

On Wed, 4 Feb 2004, Artur Merke wrote:

> Hi,
> 
> how do I recognize if a ruby file prg.rb was called as a separate program
> (from the command line) or was just included using require. Testing ARGV
> for being nil doesn't seem to work

See Ian's answer -- but also, just for future reference if needed,
note that ARGV is never nil, but is an array (possibly an empty one).  

> ######################################################################
> # file= prg.rb
> ######################################################################
> 
> if ARGV
>   print "called from command line"
> end
> 
> ######################################################################
> # file= prg2.rb
> ######################################################################
> require 'prg.rb'
> 
> print "now in prg2"

Note also that the emptiness of ARGV will depend on how prg2.rb is
called.  So if you do:

  ruby prg2.rb abc

ARGV will not be empty.


David

-- 
David A. Black
dblack@wobblini.net