Create a tinyurl from Ruby

get-tinyurl.rb

#!/usr/bin/ruby

require 'cgi'

unless ARGV.length == 1
  STDERR.puts "Usage: tinyurl <URL>"
  exit(1)
end
url = ARGV[0]

def tinyurl(url)
  tinyurl = nil
  Kernel.open( "|-", "r" ) do |f|
    if f
      tinyurl = f.read
    else
      exec "curl", "-s", "http://tinyurl.com/api-create.php?url=#{CGI.escape(url)}"
    end
  end
  tinyurl
end

puts "tinyurl is #{tinyurl(url)}"