FFS debugging/editing tool
(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
is the currently
selected i-number. The initial selected inode is the root of the file system
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 from
- Open file system fsname.
Besides the built-in editline(3)
supports these commands:
- Print out the list of accepted commands.
- Select inode i-number as the new current
- 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
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
- 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.
- 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
- 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.
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
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)