1.\" $NetBSD: dumplfs.8,v 1.10 2003/04/16 10:21:57 wiz Exp $ 2.\" 3.\" Copyright (c) 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)dumplfs.8 8.1 (Berkeley) 6/18/93 35.\" 36.Dd June 13, 2000 37.Dt DUMPLFS 8 38.Os 39.Sh NAME 40.Nm dumplfs 41.Nd dump file system information 42.Sh SYNOPSIS 43.Nm dumplfs 44.Op Fl adiS 45.Op Fl b Ar blkno 46.Op Fl I Ar blkno 47.Op Fl s Ar segno 48.Ar filesys No \&| Ar device 49.Sh DESCRIPTION 50.Nm 51prints out the file system layout information for the 52LFS file system or special device specified. 53The listing is very long and detailed. 54This command is useful mostly for finding out certain file system 55information such as the file system block size. 56.Pp 57The following flags are interpreted by 58.Nm dumplfs . 59.Bl -tag -width indent 60.It Fl a 61Dump the contents of all superblocks, not just the first. Superblocks 62appear in the dumplfs output with the segment containing them. 63.It Fl b 64Use the block specified immediately after the flag as the super block for the 65filesystem. 66.It Fl d 67Check partial segment data checksums and report mismatches. This makes 68.Nm 69operate much more slowly. 70.It Fl I 71Use the block specified immediately after the flag as the inode block 72containing the index file inode. 73.It Fl i 74Dump information about the inode free list. 75.It Fl S 76Dump information about the segment table. 77.It Fl s 78Add the segment number immediately following the flag to a list of segments to 79dump. This flag may be specified more than once to dump more than one segment. 80The default is to dump all segments. 81.El 82.Sh SEE ALSO 83.Xr disktab 5 , 84.Xr fs 5 , 85.Xr disklabel 8 , 86.Xr newfs_lfs 8 87.Sh HISTORY 88The 89.Nm dumplfs 90command appeared in 91.Bx 4.4 . 92