4.4BSD/usr/share/man/cat8/icheck.0

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ICHECK(8)          BSD System Manager's Manual          ICHECK(8)


NNAAMMEE
       icheck - file system storage consistency check

SSYYNNOOPPSSIISS
       iicchheecckk [ --bb numbers ] [ filesystem ]

DDEESSCCRRIIPPTTIIOONN
       NN..BB..::  _I_c_h_e_c_k is obsoleted for normal consistency checking
       by _f_s_c_k(8).

       _I_c_h_e_c_k 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 _i_c_h_e_c_k includes a report of

              The total number of files and the numbers of  regu-
              lar, 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 any free map.

       Following  the --bb option is a list of block numbers; when-
       ever any of the named blocks turns up in a file,  a  diag-
       nostic is produced.

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

FFIILLEESS
       Default file systems vary with installation.

SSEEEE AALLSSOO
       fsck(8), dcheck(8), ncheck(8), fs(5), clri(8)

DDIIAAGGNNOOSSTTIICCSS
       For duplicate blocks and bad blocks (which lie outside the
       file  system)  _i_c_h_e_c_k  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 _i_c_h_e_c_k considers it to contain 0.

BBUUGGSS
       Since _i_c_h_e_c_k is inherently two-pass in nature,  extraneous



4th Berkeley Distribution  June 5, 1993                         1








ICHECK(8)          BSD System Manager's Manual          ICHECK(8)


       diagnostics may be produced if applied to active file sys-
       tems.

       It believes  even  preposterous  super-blocks  and  conse-
       quently can get core images.

















































4th Berkeley Distribution  June 5, 1993                         2