Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
DUMPFS(8)		FreeBSD	System Manager's Manual		     DUMPFS(8)

     dumpfs -- dump file system	information

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

     The dumpfs	utility	prints out the super block and cylinder	group informa-
     tion for the file system or special device	specified, unless the -f, -l
     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 col-
     lapsed into ranges	and instead printed in a simple	list.  Fragment	num-
     bers may be converted to raw byte offsets by multiplying by the fragment
     size, which may be	useful when recovering deleted data.

     If	-l is specified, the pathname to the file system's container derived
     from its unique identifier	is printed.

     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.

FreeBSD	11.0			 Jul 14, 2011			  FreeBSD 11.0


Want to link to this manual page? Use this URL:

home | help