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NAME    [Toc]    [Back]

     fsdb - FFS debugging/editing tool

SYNOPSIS    [Toc]    [Back]

     fsdb [-d] -f fsname

DESCRIPTION    [Toc]    [Back]

     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

     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.

             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

     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

     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
             YYYYMMDDHHMMSS[.nsec]  where  nsec  is  an  optional
nanosecond specification.
  If  no  nanoseconds  are  specified,  the
             ctimensec, or atimensec field will be set to zero.

     quit, q, exit, <EOF>
             Exit the program.

SEE ALSO    [Toc]    [Back]

     editline(3), fs(5), clri(8), fsck(8)

HISTORY    [Toc]    [Back]

     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

BUGS    [Toc]    [Back]

     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

     There  are a bunch of other things that you might want to do
which fsdb
     doesn't implement.

WARNING    [Toc]    [Back]

     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
[ Back ]
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