optparse-exp.rb

require 'optparse'

user = nil
host = nil
path = nil
OptionParser.new do |opt|
  opt.on('-u username', '--user') { |x| user = x }
  opt.on('-h hostname', '--host') { |x| host = x }
  opt.on('--path path') { |x| path = x }
end.parse!

p user
p host
p path

# ref. http://docs.ruby-lang.org/ja/2.1.0/library/optparse.html