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DUMPFS(8)               FreeBSD System Manager's Manual              DUMPFS(8)

NAME
     dumpfs - dump file system information

SYNOPSIS
     dumpfs [-f] [-m] filesys | device

DESCRIPTION
     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.

SEE ALSO
     disktab(5), fs(5), disklabel(8), fsck(8), newfs(8), tunefs(8)

HISTORY
     The dumpfs utility appeared in 4.2BSD.

FreeBSD 11.0-PRERELEASE        January 28, 2009        FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY

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