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\" @(#)dumpfs.8 8.1 (Berkeley) 6/5/93
\"
Dd February 27, 2010
Dt DUMPFS 8
Os
Sh NAME
Nm dumpfs
Nd dump file system information
Sh SYNOPSIS
Nm
Op Fl acFijmsv
Ar filesys No \&| Ar device
Op Ar ...
Sh DESCRIPTION
Nm
prints out detailed information about the specified filesystems.
Pp
Options:
Bl -tag -width Ds
It Fl a
Print details from each alternate superblock.
It Fl c
Print details of each cylinder group.
It Fl F
Dump a file system image from a file, not a special device.
It Fl i
Print details of each allocated inode.
It Fl j
Print details of the WAPBL journal.
It Fl m
Print details of the cylinder group summary.
It Fl s
Print details of the superblock.
It Fl v
Be even more verbose.
El
Pp
If none of
Fl a ,
Fl c ,
Fl i ,
Fl j ,
Fl m ,
or
Fl s
are given, then
Nm
defaults to
Fl cmsv .
Pp
Nm
is useful mostly for finding out certain file system
information such as the file system block size, minimum
free space percentage, and (for FFSv1) the file system level that
can be upgraded with the
Fl c
option of
Xr fsck_ffs 8 .
All of this information is output by
Nm
Fl s .
Sh SEE ALSO
Xr disktab 5 ,
Xr fs 5 ,
Xr disklabel 8 ,
Xr fsck 8 ,
Xr fsck_ffs 8 ,
Xr newfs 8 ,
Xr tunefs 8
Sh HISTORY
The
Nm
command appeared in
Bx 4.2 .
The
Fl a ,
Fl c ,
Fl i ,
Fl m ,
and
Fl s
options, and the inode dump were added for
Nx 2.0 .
The
Fl j ,
option was added for
Nx 6.0 .
