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.
vde_plug -V (return code: 255)
vde_plug: unrecognized option '--version'
Usage: vde_plug [-p portnum] [-g group] [-m mod] socketname
vde_plug --help (return code: 255)
Usage: vde_plug [-p portnum] [-g group] [-m mod] socketname