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.
btrfs-calc-size -V (return code: 1)
btrfs-calc-size: invalid option -- '-'
Usage: calc-size [-v] [-b] <device>
btrfs-calc-size --help (return code: 1)
btrfs-calc-size: invalid option -- '-'
Usage: calc-size [-v] [-b] <device>