Friday, August 5, 2016


The inability of browsers to deal with shortened URLs led to the writing of a quick one-liner for verifying the final destination of a URL.

Add this line to ~/.bashrc :

alias realurl='ruby -r net/http -e "{ |s| while(r=Net::HTTP.get_response(URI(s)) and r.code[0] == \"3\"); s=r[\"location\"];end;puts s}"'

Then use the realurl alias to look up URLs:

bash# realurl

The expanded Ruby code is as follows:

#!/usr/bin/env ruby
# expand a shortened URL by following all redirects
require 'net/http'

def expand_url(str)
  while(hdr=Net::HTTP.get_response(URI(str)) and hdr.code[0] == '3')
    str = hdr['location']
  puts str

if __FILE__ == $0
  ARGV.each do |arg|
    puts expand_url arg

Sure, it would be nice to print the page Title attribute as well, but that means loading up Nokogiri and ends up being a bit of overkill.