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DUMPFS(8) System Manager's Manual DUMPFS(8) NAME dumpfs -- dump UFS file system information SYNOPSIS dumpfs [-f] [-l] [-m] [-s] filesys | device DESCRIPTION The dumpfs utility prints out the UFS super block and cylinder group information for the file system or special device specified, unless the -f, -l, -m, or -s flag is specified. The listing is very long and de- tailed. 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 frag- ment ranges, as represented in cylinder group block free lists, is printed. If the flag is specified twice, contiguous free fragments are not collapsed into ranges and instead printed in a simple list. Frag- ment numbers may be converted to raw byte offsets by multiplying by the fragment size, which may be useful when recovering deleted data. If -l is specified, the pathname to the file system's container derived from its unique identifier is printed. If -m is specified, a newfs(8) command is printed that can be used to generate a new file system with equivalent settings. Please note that newfs(8) options -E, -R, -S, and -T are not handled and -p is not use- ful in this case so is omitted. The newfs(8) options -n and -r are neither checked for nor output but should be. The -r flag is needed if the filesystem uses gjournal(8). If -s is specified, only the super block information is printed. SEE ALSO fs(5), fsck(8), gpart(8), newfs(8), tunefs(8) HISTORY The dumpfs utility appeared in 4.2BSD. FreeBSD 14.3 July 2, 2021 DUMPFS(8)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY
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