.\"	$NetBSD: dumplfs.8,v 1.11 2003/08/07 11:25:20 agc Exp $
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.\"     @(#)dumplfs.8	8.1 (Berkeley) 6/18/93
.\"
.Dd June 13, 2000
.Dt DUMPLFS 8
.Os
.Sh NAME
.Nm dumplfs
.Nd dump file system information
.Sh SYNOPSIS
.Nm dumplfs
.Op Fl adiS
.Op Fl b Ar blkno
.Op Fl I Ar blkno
.Op Fl s Ar segno
.Ar filesys No \&| Ar device
.Sh DESCRIPTION
.Nm
prints out the file system layout information for the
LFS file system or special device 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.
.Pp
The following flags are interpreted by
.Nm dumplfs .
.Bl -tag -width indent
.It Fl a
Dump the contents of all superblocks, not just the first.  Superblocks
appear in the dumplfs output with the segment containing them.
.It Fl b
Use the block specified immediately after the flag as the super block for the
filesystem.
.It Fl d
Check partial segment data checksums and report mismatches.  This makes
.Nm
operate much more slowly.
.It Fl I
Use the block specified immediately after the flag as the inode block
containing the index file inode.
.It Fl i
Dump information about the inode free list.
.It Fl S
Dump information about the segment table.
.It Fl s
Add the segment number immediately following the flag to a list of segments to
dump.  This flag may be specified more than once to dump more than one segment.
The default is to dump all segments.
.El
.Sh SEE ALSO
.Xr disktab 5 ,
.Xr fs 5 ,
.Xr disklabel 8 ,
.Xr newfs_lfs 8
.Sh HISTORY
The
.Nm dumplfs
command appeared in
.Bx 4.4 .