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MAKESURE.BAT
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DOS Batch File
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1990-01-14
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953b
|
27 lines
echo off
rem MAKESURE.BAT
rem
echo A simple command.com virus warning by Timo Salmi 23-Oct-88
rem (See CHKSUM.ARC by Bob Taylor for a much better idea.)
rem
rem First copy a certainly clean command.com to shadow.com
rem Then you need a file comparison program (here fc.exe)
rem The logic should be evident from below. D: is a ramdisk.
rem
rem Another simple trick of viral protection is always using
rem a copy of a clean command.com e.g. as follows
rem copy a:\command.com d:\command.com
rem set comspec=d:\command.com
rem Comment 14-Jan-90: This kind of protection is quite feeble. My best
rem advice would be to check all software prior using it. There are some
rem very good virus scanners for this purpose, such as McAfee Associates
rem shareware scan.exe program.
echo on
copy a:\command.com d:\
copy a:\shadow.com d:\
fc /b d:command.com d:shadow.com
del d:\command.com
del d:\shadow.com