--binary: handled binary files
--empty: check if file is empty
--skipleft=<n>: Skip <n> lines at the start of the left (first) file
--skipright=<n>: Skip <n> lines at the start of the right (second) file
Note that --binary, --empty and one or both of --skipXXX are mutual
exclusive; that is, you cannot specify more than one of them at the same
time, or the behaviour will be unpredictable.