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DOS File Protection (Summary of responses) [message #80919] Tue, 04 June 2013 00:01 Go to next message
Originally posted by: leo@uf-csv.UUCP (Leo Wilson [staff])
Message-ID: <132@uf-csv.UUCP>
Date: Fri, 2-Nov-84 17:09:52 EST
Article-I.D.: uf-csv.132
Posted: Fri Nov  2 17:09:52 1984
Date-Received: Mon, 5-Nov-84 21:02:33 EST
Organization: Univ of Fla, Computer and Information Science
Lines: 76

This line is intentionally less than witty.

I am posting this summary of responses to my inquiry about write protecting
individual files because of the number of requests I got to forward the
information.  Jay at unm-la gave the useful information, which bit to flip.
It works like a charm!

I have a friend with a copy of the Norton Utilities and used it just a few
minutes ago to change the appropriate bit.  I imagine there's a few hackers
out there who'll actually use the DOS call,  but I'm really a hardware type
who prefers a UNIX environment (DOS means Disk Operating System, I think,
but other than that I'm blissful...) to any other I've seen. You go ahead
and hack, I'll just whittle a little for now.
Bit 0 of byte 11 of a disk directory entry marks (when set) a file as read
only.  You can find the directory entry and diddle this bit directly, or
you can use DOS function call 0x43 (CHMOD), specifying the drive:path/file
as an ascii string.

Or, if you want to buy a utility to do it for you, try "AKA Alias", available
from The Programmer's Shop (800)421-8006.  It includes "xdir" which gives you
a directory listing showing the attributes of the files, and "chmod" which
sets/resets any of the attributes.  (Caveat: don't use AKA Alias for its
advertised purpose -- it knows how to hang your system at the most precious

From: akgua!mcnc!decvax!ucbvax!unmvax!unm-la!jay
	There is a utility to do that. Fortunately,
DOS 1.1 and above allow files to be marked as 'read-only'.
				- Lester Waters -
1.  To deal with write-protect/unprotect and other related things,
    you might like FilePaq, about $30 + S & H and tax, from
	SDA Associates
	PO Box 36152
	San Jose, CA 95158

2.  The above disk also includes erase/delete utilities and an
    improved  directory function.  If in addition, you patch
    out the names `del' and `era(se)' from and create
    batch files, you may solve your erasure problems.

Gene E. Bloch (...!nsc!voder!gino)
The new IBM DOS 3.0 includes a program labeled ATTRIBUTE that can set
and reset a file's attribute to read only.
DOS 3.0 is now available for list $ 65.-.
There are similar utilities on RBBS systems that are in public domain
and accessible if you have a modem and downloading capability.

John Gulbenkian   Varian Walnut Creek  CA

There are several public domain programs floating around to do this, but
I would recommend buying the Norton utilities.  They are very useful.

You could also get DOS 3.0.

David DiGiacomo, BRAG Systems Inc., San Mateo CA  (415) 342-3963
Disclaimer: The opinions expressed herein are solely those of the author.

Leo Wilson                USPS: University of Florida
akgua!uf-csv(!uf-csg)!leo       512 Weil Hall
CSNET:  leo@ufl                 Gainesville, FL  32611
AT&T:   (904)392-2371

"There are two types of aircraft: Fighters and Targets."
Re: DOS File Protection (Summary of responses) [message #80938 is a reply to message #80919] Tue, 04 June 2013 00:01 Go to previous message
scott is currently offline  scott
Messages: 4018
Registered: February 2012
Karma: 0
Senior Member
Message-ID: <934@opus.UUCP>
Date: Tue, 6-Nov-84 12:08:00 EST
Article-I.D.: opus.934
Posted: Tue Nov  6 12:08:00 1984
Date-Received: Thu, 8-Nov-84 19:24:05 EST
References: <132@uf-csv.UUCP>
Organization: NBI,Inc, Boulder CO
Lines: 14

Fair warning about file protection:  It doesn't always work.  I seem to
remember using the write protect bit PC DOS 2.0, and thought everything
would be fine until someone walked up to the machine, edited the file
and wrote it out just fine.  Since this was part of a source control system,
I wasn't very happy.  I think it had something to do with programs that 
used DOS 1.1 style i/o.  For some kind of compatibility reasons or something,
they didn't look at the write protect bit.  

Can anyone help clarify this stuff?  I haven't used a pc in over a year,
so sometimes it all seems a little fuzzy.

Scott Wiesner
{allegra, ucbvax, cornell}!nbires!scott
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