btrfs-map-logical -V (return code: 1)
btrfs-map-logical: unrecognized option '--version'
usage: btrfs-map-logical [options] device
-l Logical extent to map
-c Copy of the extent to read (usually 1 or 2)
-o Output file to hold the extent
-b Number of bytes to read
btrfs-map-logical -h (return code: 1)
btrfs-map-logical: invalid option -- 'h'
usage: btrfs-map-logical [options] device
-l Logical extent to map
-c Copy of the extent to read (usually 1 or 2)
-o Output file to hold the extent
-b Number of bytes to read