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Text File  |  1986-10-30  |  4KB  |  88 lines
  1.  
  2.           DELZ (Delete file entirely)             Steven Holzner
  3.           Command                                          No. 6
  4.  
  5.           _______________________________________________________
  6.  
  7.           Purpose:  Allows you to delete a file absolutely by
  8.                     writing over the sector(s) it occupies.
  9.  
  10.           Format:   DELZ
  11.  
  12.                     then
  13.  
  14.                     DEL/Z [d:][path][filename[.ext]]
  15.  
  16.           Remarks:  DOS does not delete files by overwriting
  17.                     them.  Rather, the sectors used by the
  18.                     "erased" file are simply made available for
  19.                     use by subsequently written files.  Until
  20.                     they are so used, however, the original file
  21.                     can be recovered with UNDEL.COM (included in
  22.                     these utilities) or by using a comparable
  23.                     commercial product.
  24.  
  25.                     Because it overwrites the sectors used by a
  26.                     file, DELZ provides complete deletion.  A
  27.                     memory-resident utility, it attaches itself
  28.                     to DOS when loaded, normally as a command
  29.                     entered through your AUTOEXEC.BAT file.
  30.                     Thereafter, until you reboot, it provides a
  31.                     /Z (for "zero out") option for the DEL
  32.                     command.
  33.  
  34.           Example:  The disk from which you boot up your PC on
  35.                     drive A: has a copy of DELZ.COM on it, and
  36.                     the disk in drive B: has a file called
  37.                     TAXCHEAT.85 that you wish to ensure is
  38.                     completely obliterated.  From the A> prompt
  39.                     you enter DELZ to load the command into
  40.                     memory.  Then you enter
  41.  
  42.                          DEL/Z B:TAXCHEAT.85
  43.  
  44.                     Even if the TAXCHEAT.85 file is unerased, its
  45.                     original contents will now be unrecoverable.
  46.                     (The contents of that file will, in fact, be
  47.                     the machine language code of DELZ.COM
  48.                     itself.)
  49.  
  50.                     Notes:
  51.  
  52.                     1.   The Z in DEL/Z must be typed uppercase.
  53.                          The use of the global characters ? and *
  54.                          is supported.
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.                                  Page -2-
  63.  
  64.                     2.   Because of possible conflicts with other
  65.                          memory-resident programs and utilities,
  66.                          you must check whether DELZ can be
  67.                          installed on your own system.  While
  68.                          SideKick has caused no reported
  69.                          difficulties, running XyWrite II or III,
  70.                          with or without its XYKBD.COM file, is
  71.                          impossible after DELZ is made resident.
  72.  
  73.                     3.   The use of DELZ.COM is likely to be
  74.                          reasonably infrequent, but sometimes it
  75.                          will be absolutely necessary.  If you
  76.                          find at those times that co-residency
  77.                          conflicts prevent putting it in your
  78.                          AUTOEXEC.BAT file, you may wish to keep
  79.                          a bootable disk (formatted with the /S
  80.                          option) with a copy of DELZ.COM and an
  81.                          AUTOEXEC.BAT file that loads the
  82.                          program.  If you then boot up from this
  83.                          disk you can destroy any file(s) you
  84.                          wish, remove the DELZ disk, and reboot
  85.                          your computer normally.
  86.  
  87.                     4.   Requires DOS 2.0 or higher.
  88.