Welcome to Darwin!
my-mac-mini:~ rbt$ irb
irb(main):001:0> puts RUBY_PLATFORM
powerpc-darwin8.0
=> nil
irb(main):002:0> system('python')
Python 2.3.5 (#1, Mar 20 2005, 20:38:20)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> print sys.platform
darwin
>>> exit
'Use Ctrl-D (i.e. EOF) to exit.'
>>> ^D
=> true
irb(main):003:0>

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