ICHECK(8)               COMMAND REFERENCE               ICHECK(8)



NAME
     icheck - file system storage consistency check

SYNOPSIS
     /etc/icheck [ -b numbers ] [ -s ] [ filesystem ]

DESCRIPTION
     N.B.: Icheck has been replaced by fsck(8) for normal
     consistency checking.

     Icheck 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 filesystem is not
     specified, a set of default file systems is checked.  The
     normal output of icheck 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-, double-, and triple-indirect blocks and
          directory blocks.

          The number of free blocks.

          The number of blocks missing; i.e. not in any file nor
          in the free list.

OPTIONS
     -b  This option is followed by a list of block numbers;
         whenever any of the specified blocks turns up in a file,
         a diagnostic is produced.

     -s  Causes icheck 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 -s option
         causes the normal output reports to be suppressed.

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

FILES
     Default file systems vary with installation.



Printed 10/17/86                                                1

ICHECK(8)               COMMAND REFERENCE               ICHECK(8)



DIAGNOSTICS
     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 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.

RETURN VALUE
     [NO_ERRS]      Command completed without error.

     [USAGE]        Incorrect command line syntax. Execution
                    terminated.

     [NP_WARN]      An error warranting a warning message
                    occurred. Execution continues.

     [P_WARN]       A system error occurred. Execution continues.
                    See intro(2) for more information on system
                    errors.

CAVEATS
     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
     can get core images.

     The system should be fixed so that the reboot after fixing
     the root file system is not necessary.

SEE ALSO
     fs(5), clri(8), fsck(8), ncheck(8).


















Printed 10/17/86                                                2

%%index%%
na:72,82;
sy:154,236;
de:390,1014;
op:1404,1278;
fi:2682,86;
di:2912,722;
rv:3634,508;
ca:4142,424;
se:4566,147;
%%index%%000000000146