When I execute a ruby script by the following:

ruby <path>helloworld.rb onlyarg

How can I find what <path> equals?

For example, in Windows, ruby C:\scripts\helloworld.rb onlyarg

helloworld.rb:
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# What can I put here to display the value C:\scripts\ or C:\scripts?
puts ARGV[0]
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output:
----------------------------------------------
onlyarg
----------------------------------------------


Thanks!

Matthew