From: Eric Hodel <drbrain@...7.net>
Date: 2009-04-21T07:11:57+09:00
Subject: Re: Which ruby is running me?

On Apr 19, 2009, at 6:44 PM, John Carter <john.carter@tait.co.nz> wrote:

> On Mon, 20 Apr 2009, James Gray wrote:
>
>> On Apr 19, 2009, at 6:45 PM, John Carter wrote:
>>
>>> What is the One True Way of finding the path to _the_ instance of  
>>> ruby
>>> that is currently executing this script?
>>
>> I'm pretty sure this always works:
>>
>> $ ruby -r rbconfig -e 'p File.join(Config::CONFIG.values_at(* 
>> %w[bindir ruby_install_name])) + Config::CONFIG["EXEEXT"]'
>> "/usr/local/bin/ruby"
>
> Thanks! Ooo.. a tad ugly though... Ah, well, at least I wasn't missing
> the obvious for a change. :-)

require 'rubygems'
Gem.ruby

$ ruby -rubygems -e 'p Gem.ruby'
"/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby"
$ ruby18 -rubygems -e 'p Gem.ruby'
"/usr/local/bin/ruby18"
$ ruby19 -e 'p Gem.ruby' # require 'rubygems' is automatic on 1.9
"/usr/local/bin/ruby19"