dumpfs - dump file system information
dumpfs [-f] [-m] filesys | device
The dumpfs utility prints out the super block and cylinder group
information for the file system or special device specified, unless the
-f or -m flag is specified. The listing is very long and detailed. This
command is useful mostly for finding out certain file system information
such as the file system block size and minimum free space percentage.
If -f is specified, a sorted list of all free fragments and free fragment
ranges, as represented in cylinder group block free lists, is printed.
If the flag is specified twice, contiguous free fragments are not
collapsed into ranges and instead printed in a simple list. Fragment
numbers may be converted to raw byte offsets by multiplying by the
fragment size, which may be useful when recovering deleted data.
If -m is specified, a newfs(8) command is printed that can be used to
generate a new file system with equivalent settings.
disktab(5), fs(5), disklabel(8), fsck(8), newfs(8), tunefs(8)
The dumpfs utility appeared in 4.2BSD.