An example of using OptionParser in Ruby

optparse_example.rb

# Restrict arguments to a specified class.
require 'optparse'

class HelloParser
  def self.parse(args)
    options = {}
    opts = OptionParser.new do |opts|
      opts.banner = "Usage: name"

      opts.on('-n', '--name NAME', 'The name of the person to say hello to') do |name|
        options[:name] = name
      end

      opts.on('-t', '--times TIMES', OptionParser::OctalInteger, 'The number of times to say hello') do |times|
        options[:times] = times
      end
    end

    begin
      opts.parse(args)
    rescue Exception => e
      puts "Exception encountered: #{e}"
      exit 1
    end

    options
  end
end

options = HelloParser.parse(ARGV)

repeat = options[:times].nil? ? 1 : options[:times]

if options[:name]
  repeat.times do
    puts "Hello, #{options[:name]}"
  end
end