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complete features.
- Accept options with the colon in the first argument;
getopts("a:bcd:") is equivalent to getopts("bc", "a:", "d:").
- Do not discard the argument that caused an error.
- Do not discard '-', which commonly stands for stdin or stdout.
- Allow specifying a long option with a value using '='.
(command --long-option=value)
- Stop reading options when it meets a non-option argument.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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