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]