From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2013-02-14T00:32:19+09:00
Subject: Re: Ruby command line options s and S

On Wed, Feb 13, 2013 at 3:59 PM, Love U Ruby <lists@ruby-forum.com> wrote:
> Can anyone help me to understand the difference between s and S with
> small snippets?

-S tells Ruby to look into the $PATH variable when searching for the
script you want to run.
For example, say you have a test.rb in /home/user/bin/test.rb
and $PATH includes that folder. You could call ruby -S test.rb from
anywhere and Ruby will get test.rb from /home/user/bin

-s tells Ruby to treat switches after the script name in a special
way. They are removed from ARGV and used to create and set a value for
global variables with that name. For example:

$ cat test.rb
puts "variable is: #{$abc}"

$ ruby -s test.rb -abc=35
variable is: 35

Jesus.