each_byte() public

Calls the given block once for each byte (0..255) in ios, passing the byte as an argument. The stream must be opened for reading or an IOError will be raised.

   f = File.new("testfile")
   checksum = 0
   f.each_byte {|x| checksum ^= x }   #=> #<File:testfile>
   checksum                           #=> 12
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