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.
xfs_io -VERSION (return code: 0)
xfs_io version 4.3.0
xfs_io --help (return code: 1)
xfs_io: invalid option -- '-'
Usage: xfs_io [-adfmnrRstVx] [-p prog] [-c cmd]... file