(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)>
is the currently selected i-number. The
initial selected inode is the root of the file system (i-number 2).
The command processor uses the
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:
- Enables additional debugging output (which comes primarily
- Open file system
Besides the built-in editline(3)
supports these commands:
- Print out the list of accepted commands.
- Select inode i-number as
the new current inode.
- Revert to the previously current inode.
- Clear the inode i-number.
- 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.
- Print out the active inode.
- Increment the active inode's link count.
- Decrement the active inode's link count.
- Set the active inode's link count to
- List the current inode's directory entries. This command is
valid only if the current inode is a directory.
- Remove the entry name from
the current directory inode. This command is valid only if the current
inode is a directory.
- 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
- Change the i-number in directory entry
- Change the name in directory entry
name. This command cannot expand a
directory entry. You can only rename an entry if the name will fit into
the existing directory slot.
- Change the type of the current inode to
type may be one of:
socket, or fifo.
- Change the mode bits of the current inode to
mode. You cannot change the file type
with this subcommand; use chtype to do that.
- Change the file flags of the current inode to
- Change the owner of the current inode to
- Change the length of the current inode to
- Change the group of the current inode to
- Change the generation number of the current inode to
- Change the modification, change, or access time
(respectively) on the current inode to
Time should be in the format
nsec is an optional nanosecond specification.
If no nanoseconds are specified, the
atimensec field will be set to zero.
- Exit the program.
uses the source code for
to implement most of the
file system manipulation code. The remainder of
first appeared in NetBSD
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
Use this tool with extreme caution – you can damage an FFS file system
beyond what fsck(8)