From: "Joseph E. Savard" <joseph.savard@...>
Date: 2010-07-28T06:20:18+09:00
Subject: Re: Which Ruby is in use?


The best way is to check your path or your #! Line....


From IRB:

ruby-1.9.2-head > RUBY_VERSION
 => "1.9.2" 
ruby-1.9.2-head > RUBY_PLATFORM
 => "i386-darwin9.8.0"
ruby-1.9.2-head > RUBY_RELEASE_DATE
 => "2010-07-14" 
ruby-1.9.2-head > RUBY_PATCHLEVEL
 => -1 
ruby-1.9.2-head > 


HERE's the money shot!


FROM A RUBY PROGRAM: [args.rb]
puts "The name of the progrma laucnhed is #{$0} OR #{$PROGRAM_NAME}"
ARGV.each do|a|

  puts "Argument: #{a}"
end

puts "And finally the ruby executable #{ENV['_']}"



<MANISH:jes> [07-27 16:17] 0 529:29  (14.35 Mb) • ~
! irb args.rb a s d
ruby-1.9.2-head > 
ruby-1.9.2-head >   puts "The name of the progrma laucnhed is #{$0} OR
#{$PROGRAM_NAME}"
The name of the progrma laucnhed is args.rb OR args.rb
 => nil 
ruby-1.9.2-head > ARGV.each do|a|
ruby-1.9.2-head >  
ruby-1.9.2-head >       puts "Argument: #{a}"
ruby-1.9.2-head ?>  end
Argument: a
Argument: s
Argument: d
 => ["a", "s", "d"]
ruby-1.9.2-head > 
ruby-1.9.2-head >   puts "And finally the ruby executable #{ENV['_']}"
And finally the ruby executable
/Users/jes/.rvm/rubies/ruby-1.9.2-head/bin/irb
 => nil 
ruby-1.9.2-head > 


OR RBCONFIG if you like:
ruby-1.9.2-head > require "rbconfig"
 => false 
ruby-1.9.2-head > puts File.join(Config::CONFIG["bindir"],
Config::CONFIG["ruby_install_name"])
/Users/jes/.rvm/rubies/ruby-1.9.2-head/bin/ruby
 => nil 
ruby-1.9.2-head > 



Make sense?



> From: Hassan Schroeder <hassan.schroeder@gmail.com>
> Reply-To: <ruby-talk@ruby-lang.org>
> Date: Wed, 28 Jul 2010 05:26:42 +0900
> To: ruby-talk ML <ruby-talk@ruby-lang.org>
> Subject: Which Ruby is in use?
> 
> Is there a way to tell from within a program which executable is being
> used -- which executable, not the version -- to run it?
> 
> Seems like there should be, but I'm striking out...
> 
> TIA,
> -- 
> Hassan Schroeder ------------------------ hassan.schroeder@gmail.com
> twitter: @hassan
>