Below is a summary of all of the options that GNU cmp accepts.
Most options have two equivalent names, one of which is a single letter
preceded by `-', and the other of which is a long name preceded by
`--'. Multiple single letter options (unless they take an
argument) can be combined into a single command line word: `-cl' is
equivalent to `-c -l'.
`-c'
Print the differing characters. Display control characters as a
`^' followed by a letter of the alphabet and precede characters
that have the high bit set with `M-' (which stands for "meta").
`--ignore-initial=bytes'
Ignore any differences in the the first bytes bytes of the input files.
Treat files with fewer than bytes bytes as if they are empty.
`-l'
Print the (decimal) byte numbers and (octal) values of all differing bytes.
`--print-chars'
Print the differing characters. Display control characters as a
`^' followed by a letter of the alphabet and precede characters
that have the high bit set with `M-' (which stands for "meta").
`--quiet'
`-s'
`--silent'
Do not print anything; only return an exit status indicating whether
the files differ.
`--verbose'
Print the (decimal) byte numbers (starting at 1) and (octal) values of all differing bytes.