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.\" 30.Dd July 2, 2021 31.Dt DUMPFS 8 32.Os 33.Sh NAME 34.Nm dumpfs 35.Nd dump UFS file system information 36.Sh SYNOPSIS 37.Nm 38.Op Fl f 39.Op Fl l 40.Op Fl m 41.Op Fl s 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 , 50.Fl m , 51or 52.Fl s 53flag is specified. 54The listing is very long and detailed. 55This 56command is useful mostly for finding out certain file system 57information such as the file system block size and minimum 58free space percentage. 59.Pp 60If 61.Fl f 62is specified, a sorted list of all free fragments and free fragment ranges, 63as represented in cylinder group block free lists, is printed. 64If the flag is specified twice, contiguous free fragments are not collapsed 65into ranges and instead printed in a simple list. 66Fragment numbers may be converted to raw byte offsets by multiplying by the 67fragment size, which may be useful when recovering deleted data. 68.Pp 69If 70.Fl l 71is specified, the pathname to the file system's container derived from 72its unique identifier is printed. 73.Pp 74If 75.Fl m 76is specified, a 77.Xr newfs 8 78command is printed that can be used to generate a new file system 79with equivalent settings. 80Please note that 81.Xr newfs 8 82options 83.Fl E , 84.Fl R , 85.Fl S , 86and 87.Fl T 88are not handled and 89.Fl p 90is not useful in this case so is omitted. 91The 92.Xr newfs 8 93options 94.Fl n 95and 96.Fl r 97are neither checked for nor output but should be. 98The 99.Fl r 100flag is needed if the filesystem uses 101.Xr gjournal 8 . 102.Pp 103If 104.Fl s 105is specified, only the super block information is printed. 106.Sh SEE ALSO 107.Xr fs 5 , 108.Xr fsck 8 , 109.Xr gpart 8 , 110.Xr newfs 8 , 111.Xr tunefs 8 112.Sh HISTORY 113The 114.Nm 115utility appeared in 116.Bx 4.2 . 117