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READ ONLY SYSTEM VARIABLE

Printed From: CAD Forum
Category: EN
Forum Name: AutoCAD
Forum Description: Discussion about AutoCAD and AutoCAD LT, viewers, DWG and DXF formats, Design Review, AutoCAD web, Drive, add-ons
URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=11183
Printed Date: 12.Jun.2026 at 12:59


Topic: READ ONLY SYSTEM VARIABLE
Posted By: eaaronf01
Subject: READ ONLY SYSTEM VARIABLE
Date Posted: 21.May.2015 at 20:12
Why is my UNDOCTL system variable set to 61 READ ONLY.
This is B.S. I cant change my undo settings, i can only undo one command.  How do you remove "READ ONLY" from a system variable?


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Eric Foster


Replies:
Posted By: Robert_D
Date Posted: 21.May.2015 at 23:15
UNDOCTL is read-only. It is used to "Indicate the state of the Auto, Control, and Group options of the UNDO command."
Use the UNDO command to change the value.

Posted By: eaaronf01
Date Posted: 21.May.2015 at 23:54
the default value keeps getting set back to 1.  i have to change this setting everytime i want to undo? i set it  to "end" and it went back too far, now i lost about 2 hours of work, how do i set it back to just undo 1 thing at a time with no limit?  Why the hell would you ever wanna change that.  I hate when they change things that worked good for me.

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Eric Foster

Posted By: John Connor
Date Posted: 22.May.2015 at 00:02
How do you lose two hours worth of work because of a malfunctioning UNDO command?

I would either restore all default settings (this would be via the Start button > All Programs > AutoCAD...) or I would do a REPAIR of the installation which is NOT the same as an uninstall / reinstall.

And try to remain calm as you are upsetting the other forum members.  Thank you and have a sparkling day.


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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance."

<<AutoCAD 2015>>

Posted By: eaaronf01
Date Posted: 22.May.2015 at 00:36
i typed in undo and it undid everything all the way back to when i started the drawing.  O.K. WHEN YOU TYPE IN UNDO, IT ASKS FOR NUMBER OF OPERATIONS TO UNDO OR A, C, BE, E, M, B AND THE DEFAULT IS <1>  IF I TYPE A FOR AUTO, THAT MEANS I CAN UNDO AS MANY OPERATIONS AS I WANT, ONE AT A TIME CORRECT?  TYPE IN A AND IT ASKS FOR AUTO MODE ON / OFF.  I WANT IT ON

NOW IF I USE THE U COMMAND RIGHT AFTER THIS, IT DOESN'T UNDO THE SYS VAR I JUST SET DOES IT? IT SHOULDN'T RIGHT?

IF I TYPE UNDO AGAIN THE DEFAULT IS STILL <1> IS THAT WHAT SHOULD BE HAPPENING?

HEY THANKS FOR YOUR HELP, APPRECIATE IT.


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Eric Foster

Posted By: John Connor
Date Posted: 22.May.2015 at 00:50
If I use UNDO once in a drawing session that's a lot.  What are you doing that you need to repeatedly invoke the command?  BTW, the setting for UNDOCTL on my system is 53 (read only) and UNDO is set to "1".

I have no idea if running UNDO after one uses it to set an UNDO option cancels that operation.  I suppose it is possible.

Set UNDO to "1" and leave it alone.

You do know that many commands have their own UNDO option don't you?


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"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance."

<<AutoCAD 2015>>


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