Print the byte number (decimal) and the differing byte values (octal) for each difference.
Print nothing for differing files; return exit status only.
Like -l but prints in hexadecimal and using zero as index for the first byte in the files.
For regular files compare file sizes first, and fail the comparison if they are not equal.
The optional arguments skip1 and skip2 are the byte offsets from the beginning of file1 and file2, respectively, where the comparison will begin. The offset is decimal by default, but may be expressed as a hexadecimal or octal value by preceding it with a leading 0x or 0.
The cmp utility exits with one of the following values:
The files are identical.
The files are different; this includes the case where one file is identical to the first part of the other. In the latter case, if the -s option has not been specified, cmp writes to standard error that EOF was reached in the shorter file (before any differences were found).