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

     fsdb -- FFS debugging/editing tool

     fsdb [-d] [-f] [-r] fsname

     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 following options are available:

     -d	     Enable additional debugging output	(which comes primarily from
	     fsck(8)-derived code).

     -f	     Left for historical reasons and has no meaning.

     -r	     Open the filesystem read/only, and	disables all commands that
	     would write to it.

     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 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.

     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 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	speci-
	     fication.	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)

     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.

     Fsdb uses the source code for fsck(8) to implement	most of	the file sys-
     tem manipulation code.  The remainder of fsdb first appeared in NetBSD,
     written by	John T.	Kohl.

     Peter Wemm	ported it to FreeBSD.

     Use this tool with	extreme	caution--you can damage	an FFS file system
     beyond what fsck(8) can repair.

FreeBSD	11.1		      September	14, 1995		  FreeBSD 11.1


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