From: Brian Candler <b.candler@...>
Date: 2011-07-29T05:38:57+09:00
Subject: Re: OptionParser on option separator "--"

It's standard option parsing behaviour. -- indicates "end of options", 
and is important if any of the subsequent parameters otherwise looks 
like an option.

require "optparse"
opts = OptionParser.new
p opts.parse(%w{hello -- world --flurble --boing})
# => ["hello", "world", "--flurble", "--boing"]

p opts.parse(%w{hello world --flurble --boing})
# invalid option: flurble

Also, quoting from the getopt(1) manpage:

"Each  parameter not starting with a `-', and not a required argument of 
a previous option, is a non-option parameter. Each  parameter  after  a 
`--' parameter is always interpreted as a non-option parameter.

-- 
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