From: "Darryl (gem dandy) Brown" <d-l-brown@...>
Date: 2010-01-01T09:50:05+09:00
Subject: Re: Path problems

On Dec 31, 7:12 pm, Luis Lavena <luislav...@gmail.com> wrote:
> On Dec 31, 9:01 pm, "Roger B. Atkins" <roger-b-atk...@cox.net> wrote:
>
> > Thanks Darryl.
>
> > The error message:
> >  >ruby Test2.rb
> >  >The system cannot find the file specified.
>
> are you invoking ruby in the directory where "Test2.rb" exist?
>
> Also, is the file named "Test2.rb" and not "test2.rb", things are case
> sensitive sometimes.
>
> --
> Luis Lavena

Hello again Roger,

Sorry if I threw too much at you....
(__FILE__) is a ruby keyword that holds the dir & file of the
program that it's used in.

Copy the below snippet into a file and run it for a better feel.



$:.unshift File.dirname(__FILE__) unless
$:.include? File.dirname(__FILE__)

puts "reveal Filename and Dirname attributes \n\n"
a = File.dirname(__FILE__)
b = File.basename(__FILE__)
c = (__FILE__)
d = File.dirname $0
e = $0
f = $PROGRAM_NAME

puts " a - the current directory => #{a}"
puts " b - the current filename => #{b}"
puts " c - the current directory and filename => #{c}"
puts " d - same output as 'a' only using $0 => #{d}"
puts " e - same as 'c' only using  $0 => #{e}"
puts " f - same as 'c' only using $PROGRAM_NAME => #{f}"



Regards,
Darryl