MirBSD manpage: fsdb(8)

FSDB(8)                  BSD System Manager's Manual                   FSDB(8)


     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 filesystem'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 com-
     mand line editing to reduce typing if desired. When you exit the command
     loop, the filesystem superblock is marked dirty and any buffered blocks
     are written to the filesystem.

     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 look-
             up. 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 com-
             mand 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 filesystem
     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 filesystem
     beyond what fsck(8) can repair.

MirBSD #10-current            September 14, 1995                             1

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