gistfile1.txt

$ ruby -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]

>> cmd = "puts Time.local(2009).zone"
=> "puts Time.local(2009).zone"
>>   ['PST', 'CST'].each do |tz|
?>       ENV['TZ'] = tz
?>       puts `ruby -e \"#{cmd}\"` # Prints two different values on Windows
?>     end
UTC
UTC
=> ["PST", "CST"]
>>   ['PST', 'CST'].each do |tz|
?>       ENV['TZ'] = tz
?>       eval(cmd) # Prints the same value on Windows since changing ENV[‘TZ’] on the fly does not work
?>     end
UTC
UTC
=> ["PST", "CST"]