From: Mike Stok <mike@...>
Date: 2013-06-23T07:56:19+09:00
Subject: Re: Load error - Std lib class Dir


On 2013-06-22, at 1:19 PM, Love U Ruby <lists@ruby-forum.com> wrote:

> Mike Stok wrote in post #1113281:
> 
> 
>> The #! line (shebang line) specifies which interpreter to use. So a
>> script starting with
>> 
>> #!/usr/bin/ruby
>> 
>> would always use the /usr/bin/ruby interpreter to run the script.
> 
> Good explanation..
> 
> So suppose I am having Ruby 1.9.3-p374, Ruby2.0.0-p0 are installed. Now 
> is the line `#!/usr/bin/ruby` would also be able to the desired version 
> as I want ? If no then how can I run the same script with different 
> version of Ruby(s)?
> 
> Thanks as always!!
> 

Using rbenv:

ratdog:tmp mike$ ls -l try.rb
-rwxr-xr-x  1 mike  mike  71 22 Jun 14:02 try.rb
ratdog:tmp mike$ cat try.rb
#!/usr/bin/env ruby

puts "I'm running under #{RUBY_VERSION}"

__END__
ratdog:tmp mike$ rbenv version
2.0.0-p195 (set by /Users/mike/.rbenv/version)
ratdog:tmp mike$ ./try.rb
I'm running under 2.0.0
ratdog:tmp mike$ rbenv shell 1.9.3-p429
ratdog:tmp mike$ rbenv version
1.9.3-p429 (set by RBENV_VERSION environment variable)
ratdog:tmp mike$ ./try.rb
I'm running under 1.9.3

So the same script runs under different interpreters depending on which version I have set to execute using rbenv.

Hope this helps,

Mike

-- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.