icheck(8)icheck(8)Nameicheck - check inode consistency
/etc/icheck [ -s ] [ -b numbers ] [ filesystem ]
The command is obsoleted for normal consistency checking by
The command examines a file system, builds a bit map of used blocks,
and compares this bit map against the free list maintained on the file
system. If the file system is not specified, a set of default file
systems is checked. The normal output of includes a report of:
· The total number of files and the numbers of regular, directory,
block special and character special files.
· The total number of blocks in use and the numbers of single-, dou‐
ble-, and triple-indirect blocks and directory blocks.
· The number of free blocks.
· The number of blocks missing, that is, not in any file nor in the
The option causes to ignore the actual free list and reconstruct a new
one by rewriting the super-block of the file system. The file system
should be dismounted while this is done; if this is not possible (for
example if the root file system has to be salvaged) care should be
taken that the system is quiescent and that it is rebooted immediately
afterwards so that the old, bad in-core copy of the super-block will
not continue to be used. Notice also that the words in the super-block
which indicate the size of the free list and of the i-list are
believed. If the super-block has been curdled these words will have to
be patched. The option causes the normal output reports to be sup‐
Following the option is a list of block numbers; whenever any of the
named blocks turns up in a file, a diagnostic is produced.
The command is faster if the raw version of the special file is used,
since it reads the i-list many blocks at a time.
For duplicate blocks and bad blocks (which lie outside the file system)
announces the difficulty, the i-number, and the kind of block involved.
If a read error is encountered, the block number of the bad block is
printed and considers it to contain 0. `Bad freeblock' means that a
block number outside the available space was encountered in the free
list. `n dups in free' means that n blocks were found in the free list
which duplicate blocks either in some file or in the earlier part of
the free list.
Since is inherently two-pass in nature, extraneous diagnostics may be
produced if applied to active file systems.
It believes even preposterous super-blocks and consequently can get
Default file systems vary with installation.
See Alsofs(5), clri(8), dcheck(8), fsck(8), ncheck(8)icheck(8)