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 May 8, 2011 32.Dt DUMPFS 8 33.Os 34.Sh NAME 35.Nm dumpfs 36.Nd dump UFS file system information 37.Sh SYNOPSIS 38.Nm 39.Op Fl f 40.Op Fl m 41.Ar filesys | device 42.Sh DESCRIPTION 43The 44.Nm 45utility prints out the UFS super block and cylinder group information 46for the file system or special device specified, unless the 47.Fl f 48or 49.Fl m 50flag is specified. 51The listing is very long and detailed. 52This 53command is useful mostly for finding out certain file system 54information such as the file system block size and minimum 55free space percentage. 56.Pp 57If 58.Fl f 59is specified, a sorted list of all free fragments and free fragment ranges, 60as represented in cylinder group block free lists, is printed. 61If the flag is specified twice, contiguous free fragments are not collapsed 62into ranges and instead printed in a simple list. 63Fragment numbers may be converted to raw byte offsets by multiplying by the 64fragment size, which may be useful when recovering deleted data. 65.Pp 66If 67.Fl m 68is specified, a 69.Xr newfs 8 70command is printed that can be used to generate a new file system 71with equivalent settings. 72.Sh SEE ALSO 73.Xr disktab 5 , 74.Xr fs 5 , 75.Xr disklabel 8 , 76.Xr fsck 8 , 77.Xr newfs 8 , 78.Xr tunefs 8 79.Sh HISTORY 80The 81.Nm 82utility appeared in 83.Bx 4.2 . 84