| DUMPFS(8) | System Manager's Manual | DUMPFS(8) | 
dumpfs —
| dumpfs | [ -acFijmsv] filesys
      | device
      [...] | 
dumpfs prints out detailed information about the
  specified filesystems.
Options:
-a-c-F-i-j-m-s-vIf none of -a, -c,
    -i, -j,
    -m, or -s are given, then
    dumpfs defaults to
  -cmsv.
dumpfs is useful mostly for finding out
    certain file system information such as the file system block size, minimum
    free space percentage, and (for FFSv1) the file system level that can be
    upgraded with the -c option of
    fsck_ffs(8). All of this
    information is output by dumpfs
    -s.
dumpfs command appeared in
  4.2BSD. The -a,
  -c, -i,
  -m, and -s options, and the
  inode dump were added for NetBSD 2.0. The
  -j, option was added for NetBSD
  6.0.
| February 27, 2010 | NetBSD 10.1 |