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@(#)dumpfs.8 8.1 (Berkeley) 6/5/93
.Dd February 27, 2010 .Dt DUMPFS 8 .Os .Sh NAME .Nm dumpfs .Nd dump file system information .Sh SYNOPSIS .Nm .Op Fl acFijmsv .Ar filesys No | Ar device .Op Ar ... .Sh DESCRIPTION .Nm prints out detailed information about the specified filesystems.
p Options: l -tag -width Ds t Fl a Print details from each alternate superblock. t Fl c Print details of each cylinder group. t Fl F Dump a file system image from a file, not a special device. t Fl i Print details of each allocated inode. t Fl j Print details of the WAPBL journal. t Fl m Print details of the cylinder group summary. t Fl s Print details of the superblock. t Fl v Be even more verbose. .El
p If none of .Fl a , .Fl c , .Fl i , .Fl j , .Fl m , or .Fl s are given, then .Nm defaults to .Fl cmsv .
p .Nm is useful mostly for finding out certain file system information such as the file system block size, minimum free space percentage, and the file system level that can be upgraded with the .Fl c option of .Xr fsck_ffs 8 . All of this information is output by .Nm .Fl s . .Sh SEE ALSO .Xr disktab 5 , .Xr fs 5 , .Xr disklabel 8 , .Xr fsck 8 , .Xr fsck_ffs 8 , .Xr newfs 8 , .Xr tunefs 8 .Sh HISTORY The .Nm command appeared in x 4.2 . The .Fl a , .Fl c , .Fl i , .Fl m , and .Fl s options, and the inode dump were added for .Nx 2.0 . The .Fl j , option was added for .Nx 6.0 .