grub: cmp

 
 17.4.14 cmp
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  -- Command: cmp [-v] file1 file2
      Compare the file FILE1 with the file FILE2.  If they are completely
      identical, ‘$?’ will be set to 0.  Otherwise, if the files are not
      identical, ‘$?’ will be set to a nonzero value.
 
      By default nothing will be output.  If the ‘-v’ is used, verbose
      mode is enabled.  In this mode when when the files differ in size,
      print the sizes like this:
 
           Differ in size: 0x1234 [foo], 0x4321 [bar]
 
      If the sizes are equal but the bytes at an offset differ, then
      print the bytes like this:
 
           Differ at the offset 777: 0xbe [foo], 0xef [bar]