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     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.