1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)dumpfs.8 8.1 (Berkeley) 6/5/93 33.\" $FreeBSD: src/sbin/dumpfs/dumpfs.8,v 1.5.2.3 2002/08/21 18:58:21 trhodes Exp $ 34.\" $DragonFly: src/sbin/dumpfs/dumpfs.8,v 1.3 2008/01/07 12:07:06 matthias Exp $ 35.\" 36.Dd June 5, 1993 37.Dt DUMPFS 8 38.Os 39.Sh NAME 40.Nm dumpfs 41.Nd dump UFS file system information 42.Sh SYNOPSIS 43.Nm 44.Op Fl m 45.Ar filesys No \&| Ar device 46.Sh DESCRIPTION 47The 48.Nm 49utility prints out the super block and cylinder group information 50for the file system or special device specified, unless 51.Fl m 52is specified. 53The listing is very long and detailed. This 54command is useful mostly for finding out certain file system 55information such as the file system block size and minimum 56free space percentage. 57.Pp 58If 59.Fl m 60is specified, a 61.Xr newfs 8 62command is printed that can be used to generate a new file system 63with equivalent settings. 64.Sh SEE ALSO 65.Xr UFS 5 , 66.Xr disktab 5 , 67.Xr fs 5 , 68.Xr disklabel 8 , 69.Xr fsck 8 , 70.Xr newfs 8 , 71.Xr tunefs 8 72.Sh HISTORY 73The 74.Nm 75utility appeared in 76.Bx 4.2 . 77