NAME
fsdb
- FFS debugging/editing tool
SYNOPSIS
fsdb
[-dFn]
-f fsname
DESCRIPTION
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 filesystem (i-number 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
-d
option enables additional debugging output (which comes primarily from
fsck(8)-derived
code).
The
-F
option indicates that
filesystem
is a file system image, rather than a raw character device.
It will be accessed
`as-is',
and no attempts will be made to read a disklabel.
The
-n
option disables writing to the device, preventing any changes from being made
to the filesystem.
COMMANDS
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
-
Clear the current inode.
- 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.
- blks
-
List the current inode's blocks numbers.
- findblk disk block number ...
-
Find the inode(s) owning the specified disk block(s) number(s).
Note that these are not absolute disk blocks numbers, but offsets from the
start of the partition.
- 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.
- 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.
SEE ALSO
editline(3),
fs(5),
clri(8),
fsck(8)
HISTORY
fsdb
uses the source code for
fsck(8)
to implement most of the file system manipulation code.
The remainder of
fsdb
first appeared in
NetBSD1.1.
WARNING
Use this tool with extreme caution -- you can damage an FFS file system
beyond what
fsck(8)
can repair.
BUGS
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.