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ruby--ruby/doc/optparse/ruby/long_simple.rb

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require 'optparse'
parser = OptionParser.new
parser.on('--xxx', 'One long name') do |value|
p ['--xxx', value]
end
parser.on('--y1%', '--z2#', 'Two long names (aliases)') do |value|
p ['--y1% or --z2#', value]
end
parser.parse!