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.Dd July 2, 2021 29.Dt DUMPFS 8 30.Os 31.Sh NAME 32.Nm dumpfs 33.Nd dump UFS file system information 34.Sh SYNOPSIS 35.Nm 36.Op Fl f 37.Op Fl l 38.Op Fl m 39.Op Fl s 40.Ar filesys | device 41.Sh DESCRIPTION 42The 43.Nm 44utility prints out the UFS super block and cylinder group information 45for the file system or special device specified, unless the 46.Fl f , 47.Fl l , 48.Fl m , 49or 50.Fl s 51flag is specified. 52The listing is very long and detailed. 53This 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 f 60is specified, a sorted list of all free fragments and free fragment ranges, 61as represented in cylinder group block free lists, is printed. 62If the flag is specified twice, contiguous free fragments are not collapsed 63into ranges and instead printed in a simple list. 64Fragment numbers may be converted to raw byte offsets by multiplying by the 65fragment size, which may be useful when recovering deleted data. 66.Pp 67If 68.Fl l 69is specified, the pathname to the file system's container derived from 70its unique identifier is printed. 71.Pp 72If 73.Fl m 74is specified, a 75.Xr newfs 8 76command is printed that can be used to generate a new file system 77with equivalent settings. 78Please note that 79.Xr newfs 8 80options 81.Fl E , 82.Fl R , 83.Fl S , 84and 85.Fl T 86are not handled and 87.Fl p 88is not useful in this case so is omitted. 89The 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.Pp 101If 102.Fl s 103is specified, only the super block information is printed. 104.Sh SEE ALSO 105.Xr fs 5 , 106.Xr fsck 8 , 107.Xr gpart 8 , 108.Xr newfs 8 , 109.Xr tunefs 8 110.Sh HISTORY 111The 112.Nm 113utility appeared in 114.Bx 4.2 . 115