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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