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. 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 16, 2013 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 l 41.Op Fl m 42.Ar filesys | device 43.Sh DESCRIPTION 44The 45.Nm 46utility prints out the UFS super block and cylinder group information 47for the file system or special device specified, unless the 48.Fl f , 49.Fl l 50or 51.Fl m 52flag is specified. 53The listing is very long and detailed. 54This 55command is useful mostly for finding out certain file system 56information such as the file system block size and minimum 57free space percentage. 58.Pp 59If 60.Fl f 61is specified, a sorted list of all free fragments and free fragment ranges, 62as represented in cylinder group block free lists, is printed. 63If the flag is specified twice, contiguous free fragments are not collapsed 64into ranges and instead printed in a simple list. 65Fragment numbers may be converted to raw byte offsets by multiplying by the 66fragment size, which may be useful when recovering deleted data. 67.Pp 68If 69.Fl l 70is specified, the pathname to the file system's container derived from 71its unique identifier is printed. 72.Pp 73If 74.Fl m 75is specified, a 76.Xr newfs 8 77command is printed that can be used to generate a new file system 78with equivalent settings. 79Please note that 80.Xr newfs 8 81options 82.Fl E , 83.Fl R , 84.Fl S , 85and 86.Fl T 87are not handled and 88.Fl p 89is not useful in this case so is omitted. 90.Xr Newfs 8 91options 92.Fl n 93and 94.Fl r 95are neither checked for nor output but should be. 96The 97.Fl r 98flag is needed if the filesystem uses 99.Xr gjournal 8 . 100.Sh SEE ALSO 101.Xr fs 5 , 102.Xr fsck 8 , 103.Xr gpart 8 , 104.Xr newfs 8 , 105.Xr tunefs 8 106.Sh HISTORY 107The 108.Nm 109utility appeared in 110.Bx 4.2 . 111