Create unique long URL's out of A's
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com
$ ruby -pe '$_.gsub!(/./) {|c| ("%08b" % c.ord).tr("01", "Aa") }' <<< http://google.com
AaaAaAAAAaaaAaAAAaaaAaAAAaaaAAAAAAaaaAaAAAaAaaaaAAaAaaaaAaaAAaaaAaaAaaaaAaaAaaaaAaaAAaaaAaaAaaAAAaaAAaAaAAaAaaaAAaaAAAaaAaaAaaaaAaaAaaAa
Then to decode: $ ruby -pe '$_.gsub!(/.{8}/) {|s| s.tr("Aa", "01").to_i(2).chr }' <<< AaaAaAAAAaaaAaAAAaaaAaAAAaaaAAAAAAaaaAaAAAaAaaaaAAaAaaaaAaaAAaaaAaaAaaaaAaaAaaaaAaaAAaaaAaaAaaAAAaaAAaAaAAaAaaaAAaaAAAaaAaaAaaaaAaaAaaAa
http://google.com
EDIT: Wow. I hadn't noticed that HN got rid of the horizontal scrolling behaviour for indented text. It's funny that I kind of miss it in this case. http://aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.com/AaAAAaaaAAaaAAAaAAaa