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 July 2, 2021 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.Op Fl s 43.Ar filesys | device 44.Sh DESCRIPTION 45The 46.Nm 47utility prints out the UFS super block and cylinder group information 48for the file system or special device specified, unless the 49.Fl f , 50.Fl l , 51.Fl m , 52or 53.Fl s 54flag is specified. 55The listing is very long and detailed. 56This 57command is useful mostly for finding out certain file system 58information such as the file system block size and minimum 59free space percentage. 60.Pp 61If 62.Fl f 63is specified, a sorted list of all free fragments and free fragment ranges, 64as represented in cylinder group block free lists, is printed. 65If the flag is specified twice, contiguous free fragments are not collapsed 66into ranges and instead printed in a simple list. 67Fragment numbers may be converted to raw byte offsets by multiplying by the 68fragment size, which may be useful when recovering deleted data. 69.Pp 70If 71.Fl l 72is specified, the pathname to the file system's container derived from 73its unique identifier is printed. 74.Pp 75If 76.Fl m 77is specified, a 78.Xr newfs 8 79command is printed that can be used to generate a new file system 80with equivalent settings. 81Please note that 82.Xr newfs 8 83options 84.Fl E , 85.Fl R , 86.Fl S , 87and 88.Fl T 89are not handled and 90.Fl p 91is not useful in this case so is omitted. 92The 93.Xr newfs 8 94options 95.Fl n 96and 97.Fl r 98are neither checked for nor output but should be. 99The 100.Fl r 101flag is needed if the filesystem uses 102.Xr gjournal 8 . 103.Pp 104If 105.Fl s 106is specified, only the super block information is printed. 107.Sh SEE ALSO 108.Xr fs 5 , 109.Xr fsck 8 , 110.Xr gpart 8 , 111.Xr newfs 8 , 112.Xr tunefs 8 113.Sh HISTORY 114The 115.Nm 116utility appeared in 117.Bx 4.2 . 118