NRuby

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basic.rb:
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    # Require the OptionParser code.
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    require 'optparse'
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    # Create an OptionParser object.
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    parser = OptionParser.new
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    # Define one or more options.
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    parser.on('-x', 'Whether to X') do |value|
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    p ['x', value]
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    end
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    parser.on('-y', 'Whether to Y') do |value|
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    p ['y', value]
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    end
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    parser.on('-z', 'Whether to Z') do |value|
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    p ['z', value]
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    end
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    # Parse the command line and return pared-down ARGV.
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    p parser.parse!
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$ ruby basic.rb --help
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    Usage: basic [options]
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        -x                               Whether to X
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        -y                               Whether to Y
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        -z                               Whether to Z