which Ruby is in use?

[Hassan Schroeder]

How can I tell from within a running program which interpreter is being
used -- i.e. MRI, REE, etc.?

RUBY_VERSION only returns a number, .e.g. "1.8.7".

TIA,

 

[Steve Klabnik]

[Note: parts of this message were removed to make it a legal post.]

RUBY_DESCRIPTION will give you something like this:

ruby-1.9.2-p0 > RUBY_DESCRIPTION
=> "ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]"
ree-1.8.7-2010.02 > RUBY_DESCRIPTION
=> "ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-darwin10.4.0], MBARI
0x6770, Ruby Enterprise Edition 2010.02"

 

[Hassan Schroeder]

RUBY_DESCRIPTION

Ah, that's it -- I know I've seen that before, but couldn't dredge it out
of the musty corners -- thanks much!

 

[Quintus]

Am 27.01.2011 18:14, schrieb Hassan Schroeder:

How can I tell from within a running program which interpreter is being
used -- i.e. MRI, REE, etc.?

RUBY_VERSION only returns a number, .e.g. "1.8.7".

TIA,

The RUBY_ENGINE constant should define this, but I'm not sure wheather
it's already in 1.8.

Vale,
Marvin

 

[Hassan Schroeder]

The RUBY_ENGINE constant should define this, but I'm not sure wheather
it's already in 1.8.

That doesn't appear to be defined in at least this Mac's MRI 1.8.7.

RUBY_VERSION => "1.8.7"
RUBY_DESCRIPTION => "ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]"
RUBY_ENGINE

NameError: uninitialized constant RUBY_ENGINE

Thanks for pointing it out, though.

 

[Adam Prescott]

[Note: parts of this message were removed to make it a legal post.]

On Thu, Jan 27, 2011 at 5:30 PM, Hassan Schroeder <

Ah, that's it -- I know I've seen that before, but couldn't dredge it out
of the musty corners -- thanks much!

You might find Object.constants.grep(/RUBY/) useful to remind yourself.

$ ruby -e 'Object.constants.grep(/RUBY/).each { |c| puts "#{c} =>
#{Object.const_get(c)}" }'

 

[Hassan Schroeder]

You might find Object.constants.grep(/RUBY/) useful to remind yourself.

$ ruby -e 'Object.constants.grep(/RUBY/).each { |c| puts "#{c} =>
#{Object.const_get(c)}" }'

D'oh! Thanks for the reminder. Apparently I needed a lot more coffee
this morning...

 

[Josh Cheek]

[Note: parts of this message were removed to make it a legal post.]

On Thu, Jan 27, 2011 at 11:14 AM, Hassan Schroeder <

How can I tell from within a running program which interpreter is being
used -- i.e. MRI, REE, etc.?

RUBY_VERSION only returns a number, .e.g. "1.8.7".

TIA,

If you're using RVM, there is also some good stuff in the ENV hash.

 

[Steve Klabnik]

[Note: parts of this message were removed to make it a legal post.]

No worries. Here's how I found it:

irb
RUBY_<tab><tab><tab><tab>

Then I tried a few of the results.