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

     dumpfs -- dump UFS	file system information

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

     The dumpfs	utility	prints out the UFS super block and cylinder group in-
     formation for the file system or special device specified,	unless the -f,
     -l, -m, or	-s flag	is specified.  The listing is very long	and detailed.
     This command is useful mostly for finding out certain file	system infor-
     mation such as the	file system block size and minimum free	space percent-

     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.  Please note that
     newfs(8) options -E, -R, -S, and -T are not handled and -p	is not useful
     in	this case so is	omitted.  Newfs(8) options -n and -r are neither
     checked for nor output but	should be.  The	-r flag	is needed if the
     filesystem	uses gjournal(8).

     If	-s is specified, only the super	block information is printed.

     fs(5), fsck(8), gpart(8), newfs(8), tunefs(8)

     The dumpfs	utility	appeared in 4.2BSD.

FreeBSD	13.0			 July 2, 2021			  FreeBSD 13.0


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