Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
add-apt-key -V (return code: 1)
usage: add-apt-key [-h|--help] [-v|--verbose] [-k|--keyserver name] key-id
add-apt-key --help (return code: 0)
usage: add-apt-key [-h|--help] [-v|--verbose] [-k|--keyserver name] key-id