1.\" $OpenBSD: dumpfs.8,v 1.10 2007/05/31 19:19:44 jmc Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)dumpfs.8 8.1 (Berkeley) 6/5/93 31.\" 32.Dd $Mdocdate: May 31 2007 $ 33.Dt DUMPFS 8 34.Os 35.Sh NAME 36.Nm dumpfs 37.Nd dump file system information 38.Sh SYNOPSIS 39.Nm dumpfs 40.Op Fl m 41.Ar filesys | device 42.Sh DESCRIPTION 43.Nm 44prints out the super block and cylinder group information 45for the file system or special device specified, unless 46.Fl m 47is specified. 48The listing is very long and detailed. 49.Pp 50.Nm 51is useful mostly for finding out certain file system 52information such as the file system block size, minimum 53free space percentage, and the file system level that 54can be upgraded with the 55.Fl c 56option of 57.Xr fsck_ffs 8 . 58All of this information can be found within the first twenty 59lines of the output. 60.Pp 61If 62.Fl m 63is specified, a 64.Xr newfs 8 65command is output that can be used to generate a new file system 66with equivalent settings. 67.Sh SEE ALSO 68.Xr disktab 5 , 69.Xr fs 5 , 70.Xr disklabel 8 , 71.Xr fsck 8 , 72.Xr fsck_ffs 8 , 73.Xr growfs 8 , 74.Xr newfs 8 , 75.Xr tunefs 8 76.Sh HISTORY 77The 78.Nm 79command appeared in 80.Bx 4.2 . 81