China DOS Union

How to prevent doskey.com from being unloaded from memory? Please, great experts, give me some advice. Thanks!

doskey seems to have no uninstall function itself, just like smartdrv

doskey -u can unload doskey from memory

doskey -R can reload doskey from memory

Now the question is: How to make the "doskey -u" command invalid?

Which version of DOS's doskey are you talking about?

DOS version:
Windows Millennium [Version 4.90.3000]

This doskey.com is extracted from the MS-DOS 7.1 image file, it should be the 7.1 version. After trial, it can also be applied in the Windows Millennium [Version 4.90.3000] DOS version

Strange, my doskey doesn't have this parameter. Probably yours is developed by a third party

Open Doskey.exe file in binary with Edit.com and change the -u parameter to other characters

Under the WINXP environment, how to modify Doskey with HexEdit, that is, how to visually find the -u command

Re martin325:

The doskey.com in MS-DOS 7.10 is indeed a third-party tool, an enhanced version written by Paul Houle, which can be found out by using doskey /? | more. For the doskey versions of MSDOS 6.22 and below, Windows 9x and above, which are from Microsoft themselves, there are no uninstall parameters.

As for finding the location of the command-line parameters for doskey in DOS/Win, this must be determined through trace debugging using a debugging tool. It cannot be known through ordinary searching methods. That is, simply using edit / hexedit cannot achieve the prohibition of the /u parameter unless its address is already known.

In addition, it should be reminded that even if doskey always resides in memory, it cannot prohibit the addition, modification, and deletion of doskey macro commands. Therefore, the disabling of write commands implemented by doskey can be easily lifted.

Where can I find a download for DOSKEY without the uninstall parameter?
And this DOSKEY is applicable for use in the Windows Millennium [Version 4.90.3000] DOS version.
Please help, big shot :)

If doskey always resides in memory, how to remove the addition, modification, and deletion of the forbidden doskey macro commands?

Excuse me, expert on the 7th floor, can you upload your Doskey?

Re martin325:

DOSKEY should be present in all Windows versions and most MS-DOS versions. It's just that the doskey.com under MS-DOS has version restrictions, and the 32-bit doskey.exe under WinNTs can't run under 16-bit MS-DOS. Doesn't your WinME have doskey.com? Then you can try doskey.com under Win98?

Creating, modifying, and deleting DOSKEY macros is very simple, similar to environment variable setting statements like set.

Create or modify: doskey del=none
Delete: doskey del=

As for what you call "removing", I understand it as prohibiting the operation of the doskey command, which is usually more complicated. But there is also a tricky way: doskey doskey=cls, which also prohibits the doskey command, so you can't use doskey at the command line, and naturally you can't modify and delete macro commands.

Of course, "the way is one foot high, the devil is ten feet high", this trick can also be easily broken, and there are more than one solution (already got 4 kinds), but fewer people know it. Here, it can be used as a guessing question. Let the high-level experts express their opinions and see if they can get answers different from what I have in mind.

[ Last edited by willsort on 2006-2-22 at 13:47 ]

Haha, I don't know what "high-level expert" mentioned by Xiaotian means by "high level" and what kind of person a "expert" is.

After reading your prize-free quiz. I roughly point out, let's see if we think of the same thing

space
batch
ren
alt-

Originally I just thought that martin325 playing this kind of "encryption" is not very interesting, but it's also interesting for everyone to communicate and exchange skills together. Haha