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DUMPFS(8) BSD System Manager's Manual DUMPFS(8) NAME dumpfs -- dump file system information SYNOPSIS dumpfs [-f] [-m] filesys | device DESCRIPTION The dumpfs utility prints out the super block and cylinder group informa- tion for the file system or special device specified, unless the -f or -m flag is specified. The listing is very long and detailed. This command is useful mostly for finding out certain file system information such as the file system block size and minimum free space percentage. If -f is specified, a sorted list of all free fragments and free fragment ranges, as represented in cylinder group block free lists, is printed. If the flag is specified twice, contiguous free fragments are not col- lapsed into ranges and instead printed in a simple list. Fragment num- bers may be converted to raw byte offsets by multiplying by the fragment size, which may be useful when recovering deleted data. If -m is specified, a newfs(8) command is printed that can be used to generate a new file system with equivalent settings. SEE ALSO disktab(5), fs(5), disklabel(8), fsck(8), newfs(8), tunefs(8) HISTORY The dumpfs utility appeared in 4.2BSD. BSD January 19, 2003 BSD
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