fsdb - FFS debugging/editing tool
fsdb [-d] -f fsname
fsdb opens fsname (usually a raw disk partition) and runs a
command loop
allowing manipulation of the file system's inode data. You
are prompted
to enter a command with fsdb (inum X)> where X is the currently selected
i-number. The initial selected inode is the root of the
file system (inumber
2).
The command processor uses the editline(3) library, so you
can use command
line editing to reduce typing if desired. When you exit the command
loop, the file system superblock is marked dirty and any
buffered blocks
are written to the file system.
The options are as follows:
-d Enables additional debugging output (which comes
primarily from
fsck(8)-derived code).
Besides the built-in editline(3) commands, fsdb supports
these commands:
help Print out the list of accepted commands.
inode i-number
Select inode i-number as the new current inode.
back Revert to the previously current inode.
clri i-number
Clear the inode i-number.
lookup name, cd name
Find name in the current directory and make its inode the current
inode. Name may be a multi-component name or may
begin with
slash to indicate that the root inode should be used
to start the
lookup. If some component along the pathname is not
found, the
last valid directory encountered is left as the active inode.
This command is valid only if the starting inode is
a directory.
active, print
Print out the active inode.
uplink Increment the active inode's link count.
downlink
Decrement the active inode's link count.
linkcount number
Set the active inode's link count to number.
ls List the current inode's directory entries. This
command is
valid only if the current inode is a directory.
rm name, del name
Remove the entry name from the current directory inode. This
command is valid only if the current inode is a directory.
ln ino name
Create a link to inode ino under the name name in
the current directory
inode. This command is valid only if the
current inode
is a directory.
chinum dirslot inum
Change the i-number in directory entry dirslot to
inum.
chname dirslot name
Change the name in directory entry dirslot to name.
This command
cannot expand a directory entry. You can only rename an entry if
the name will fit into the existing directory slot.
chtype type
Change the type of the current inode to type. type
may be one
of: file, dir, socket, or fifo.
chmod mode
Change the mode bits of the current inode to mode.
You cannot
change the file type with this subcommand; use
chtype to do that.
chflags flags
Change the file flags of the current inode to flags.
chown uid
Change the owner of the current inode to uid.
chlen length
Change the length of the current inode to length.
chgrp gid
Change the group of the current inode to gid.
chgen gen
Change the generation number of the current inode to
gen.
mtime time, ctime time, atime time
Change the modification, change, or access time (respectively) on
the current inode to time. Time should be in the
format
YYYYMMDDHHMMSS[.nsec] where nsec is an optional
nanosecond specification.
If no nanoseconds are specified, the
mtimensec,
ctimensec, or atimensec field will be set to zero.
quit, q, exit, <EOF>
Exit the program.
editline(3), fs(5), clri(8), fsck(8)
fsdb uses the source code for fsck(8) to implement most of
the file system
manipulation code. The remainder of fsdb first appeared
in NetBSD
1.1.
Manipulation of ``short'' symlinks doesn't work (in particular, don't try
changing a symlink's type).
You must specify modes as numbers rather than symbolic
names.
There are a bunch of other things that you might want to do
which fsdb
doesn't implement.
Use this tool with extreme caution - you can damage an FFS
file system
beyond what fsck(8) can repair.
OpenBSD 3.6 September 14, 1995
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