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31 .Dd September 14, 1995
36 .Nd FFS debugging/editing tool
47 (usually a raw disk partition) and runs a command loop
48 allowing manipulation of the file system's inode data. You are prompted
49 to enter a command with
53 is the currently selected i-number. The initial selected inode is the
54 root of the filesystem (i-number 2).
55 The command processor uses the
57 library, so you can use command line editing to reduce typing if desired.
58 When you exit the command loop, the file system superblock is marked
59 dirty and any buffered blocks are written to the file system.
61 The following options are available:
62 .Bl -tag -width indent
64 Enable additional debugging output (which comes primarily from
68 Left for historical reasons and has no meaning.
70 Open the filesystem read/only, and disables all commands that would
78 supports these commands:
80 .Bl -tag -width indent -compact
82 Print out the list of accepted commands.
84 .It Cm inode Ar i-number
87 as the new current inode.
90 Revert to the previously current inode.
93 Clear the current inode.
99 in the current directory and make its inode the current inode.
101 may be a multi-component name or may begin with slash to indicate that
102 the root inode should be used to start the lookup. If some component
103 along the pathname is not found, the last valid directory encountered is
104 left as the active inode.
106 This command is valid only if the starting inode is a directory.
110 Print out the active inode.
113 Increment the active inode's link count.
116 Decrement the active inode's link count.
118 .It Cm linkcount Ar number
119 Set the active inode's link count to
123 List the current inode's directory entries. This command is valid only
124 if the current inode is a directory.
130 from the current directory inode. This command is valid only
131 if the current inode is a directory.
133 .It Cm ln Ar ino Ar name
134 Create a link to inode
138 in the current directory inode. This command is valid only
139 if the current inode is a directory.
141 .It Cm chinum Ar dirslot Ar inum
142 Change the i-number in directory entry
147 .It Cm chname Ar dirslot Ar name
148 Change the name in directory entry
152 This command cannot expand a directory entry. You can only rename an
153 entry if the name will fit into the existing directory slot.
155 .It Cm chtype Ar type
156 Change the type of the current inode to
167 Change the mode bits of the current inode to
169 You cannot change the file type with this subcommand; use
173 .It Cm chflags Ar flags
174 Change the file flags of the current inode to
178 Change the owner of the current inode to
182 Change the group of the current inode to
186 Change the generation number of the current inode to
192 Change the modification, change, or access time (respectively) on the
196 should be in the format
197 .Em YYYYMMDDHHMMSS[.nsec]
200 is an optional nanosecond specification. If no nanoseconds are specified, the
205 field will be set to zero.
207 .It Cm quit, Cm q, Cm exit, Em <EOF>
216 Manipulation of ``short'' symlinks doesn't work (in particular, don't
217 try changing a symlink's type).
219 You must specify modes as numbers rather than symbolic names.
221 There are a bunch of other things that you might want to do which
226 uses the source code for
228 to implement most of the file system manipulation code. The remainder of
239 Use this tool with extreme caution--you can damage an FFS file system