icheck man page on DigitalUNIX

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icheck(8)							     icheck(8)

       icheck - File system storage consistency check

       /usr/sbin/icheck [-b numbers] [file system]

       The  icheck  command  is	 obsoleted  for normal consistency checking by

       The icheck command examines a file system, builds a  bit	 map  of  used
       blocks,	and  compares  this bit map against the free map maintained on
       the file system. If the file system is not specified, a set of  default
       file  systems is checked. The normal output of icheck includes a report
       of the following items: The total number of files and  the  numbers  of
       regular,	 directory,  block special, character special, and fifo files.
       The total number of blocks in use and the numbers of single-  and  dou‐
       ble-indirect  blocks  and directory blocks.  The number of free blocks.
       The number of blocks missing; that is, not in any file or in  any  free

       A  list	of  block  numbers  follows the -b option; whenever any of the
       named blocks turn up in a file, a diagnostic is produced.

       The icheck command is faster if the raw version of the special file  is
       used since it reads the i-list many blocks at a time.

       Since  icheck  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 causes a core dump.

       For  duplicate blocks and bad blocks which lie outside the file system,
       icheck 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 icheck considers it to contain zero.

       Specifies the command path.

       Commands: clri(8), fsck(8), ncheck(8)


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