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BSD 2.11 - man page for clri (bsd section 8)

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CLRI(8) 										  CLRI(8)

       clri - clear i-node

       clri filesystem i-number ...

       Clri  writes  zeros  on	the  i-nodes with the decimal i-numbers on the filesystem.  After
       clri, any blocks in the affected file will show up as `missing' in  an  icheck(8)  of  the

       Read  and  write  permission  is required on the specified file system device.  The i-node
       becomes allocatable.

       The primary purpose of this routine is to remove a file which for some reason  appears  in
       no  directory.	If  it	is  used  to zap an i-node which does appear in a directory, care
       should be taken to track down the entry and remove it.	Otherwise,  when  the  i-node  is
       reallocated  to some new file, the old entry will still point to that file.  At that point
       removing the old entry will destroy the new file.  The new entry will again  point  to  an
       unallocated i-node, so the whole cycle is likely to be repeated again and again.

       fsck(8), icheck(8)

       If the file is open, clri is likely to be ineffective.

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