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.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)dumpfs.8 8.1 (Berkeley) 6/5/93 29.\" $FreeBSD$ 30.\" 31.Dd January 19, 2003 32.Dt DUMPFS 8 33.Os 34.Sh NAME 35.Nm dumpfs 36.Nd dump file system information 37.Sh SYNOPSIS 38.Nm 39.Op Fl m 40.Ar filesys | device 41.Sh DESCRIPTION 42The 43.Nm 44utility prints 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. 49This 50command is useful mostly for finding out certain file system 51information such as the file system block size and minimum 52free space percentage. 53.Pp 54If 55.Fl m 56is specified, a 57.Xr newfs 8 58command is printed that can be used to generate a new file system 59with equivalent settings. 60.Sh SEE ALSO 61.Xr disktab 5 , 62.Xr fs 5 , 63.Xr disklabel 8 , 64.Xr fsck 8 , 65.Xr newfs 8 , 66.Xr tunefs 8 67.Sh HISTORY 68The 69.Nm 70utility appeared in 71.Bx 4.2 . 72