Ruby/Development/RUBY PLATFORM

if RUBY_PLATFORM =~ /win32/
  puts "We"re in Windows!"
elsif RUBY_PLATFORM =~ /linux/
  puts "We"re in Linux!"
elsif RUBY_PLATFORM =~ /darwin/
  puts "We"re in Mac OS X!"
elsif RUBY_PLATFORM =~ /freebsd/
  puts "We"re in FreeBSD!"
else
  puts "We"re running under an unknown operating system."
end