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| DUMPFS(8) | FreeBSD System Manager's Manual | DUMPFS(8) |
NAME
dumpfs —
SYNOPSIS
dumpfs |
[-f] [-l]
[-m] [-s]
filesys | device |
DESCRIPTION
Thedumpfs utility prints out the UFS super block and
cylinder group information 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 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 -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.
SEE ALSO
fs(5), fsck(8), gpart(8), newfs(8), tunefs(8)HISTORY
Thedumpfs utility appeared in
4.2BSD.
| July 2, 2021 | FreeBSD 13.1-RELEASE |
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