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From CoCoWiki

CMP

CMP compares 2 files at the byte level. It will display the file offset and the value of the byte from every file when a difference is find.

Syntax: CMP <path1> <path2>

Example:

CMP /do/CMDS/xmode /d1/CMDS/xmode

If the files are identical, it returns

Differences
None ...
Bytes compared:  00000439
Bytes different: 00000000

If the files are different, the result will be something like

Differences
byte      #1 #2
========  == ==
00000007  80 81
00000008  66 67
0000004C  70 58
Bytes compared:  00000439
Bytes different: 00000003