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.
tcpkill -V (return code: 1)
tcpkill: invalid option -- '-'
Version: 2.4
Usage: tcpkill [-i interface] [-1..9] expression
tcpkill --help (return code: 1)
tcpkill: invalid option -- '-'
Version: 2.4
Usage: tcpkill [-i interface] [-1..9] expression