4.3BSD-Reno/share/man/cat8/icheck.0

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ICHECK(8)		      1990			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 main-
     tained on the file system.  If the file system is not speci-
     fied, 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 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 direc-
	  tory 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; whenever
     any of the named blocks turns up in a file, a diagnostic 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 encoun-
     tered, 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
     diagnostics may be produced if applied to active file sys-
     tems.



Printed 7/27/90               June				1






ICHECK(8)		      1990			ICHECK(8)



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





















































Printed 7/27/90               June				2