decode64(str) public

Returns the Base64-decoded version of str. 

  require 'base64'
  str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' +
        'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' +
        'ZSB0aHJlZQpBbmQgc28gb24uLi4K'
  puts Base64.decode64(str)

Generates: 

   This is line one
   This is line two
   This is line three
   And so on...
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