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CHECK-OS.DOC
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1988-03-06
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Check-OS - a program to guard against Viruses.
This program was written to be compiled with Turbo Pascal version 4.0. It
checks the Filesize, File Date/Time (last updated), and Checksum of
COMMAND.COM, AUTOEXEC.BAT, and CONFIG.SYS. It was developed to verify that
no virus had installed itself in DOS. It does not stay resident to guard
against Viruses, it just checks the specified drive once when the program is
invoked. It also doesn't have terribly extensive error checking so little
things like the disk being too full to create the Control file, or a Write
protect error will cause a runtime error. I didn't feel it was necessary to
fix these since I only use the program on my hard disk.
To use it, type CHECK-OS DRIVE where DRIVE is the drive letter containing
the DOS to be checked. I would recommend putting the command in your
AUTOEXEC.BAT so it's control file (\CHECK-OS.CTL) is kept current.
I've done fairly extensive testing on a Bullet 286 (AT clone) but the source
is included since 1) I don't have access to enough systems to do as much
testing as I'd like and 2) because I hate using PD software without having
the source (it gives me a warm fuzzy feeling to collect source to things I
use frequently).
No warranty is given with this software - use at your own risk.
I can be reached on GEnie as R.BARTLETT if you'd like to send any comments,
questions, or jokes involving COBOL programmers.
R.J. Bartlett 05 March 1988