UNDO Command — GstarCAD 2027
UNDO Command
GstarCAD 2027 · Command Reference
Commands > U Command > UNDO
Function Description:
This command is used to give up the effect of commands.
At the Command prompt, it displays commands and system variable names that used before.
Note: The UNDO command is invalid for some commands and system variables, for example, open, close, or save
a viewport
or a drawing, display information, change the display mode, regenerate the drawing or export
the drawing in a different format.
Command Access:
Icon:
Menu: /
Ribbon: /
Toolbar: Standard > Undo
Command: UNDO
Alias: /
Command Prompts:
Enter the number of operations to undo or [Auto/Control/BEgin/End/Mark/Back] \<1>:
Enter the number of operations to undo
Specifies the number of operations to undo. It is equivalent to entering U multiple times.
Auto
If the Control option is turned off or restricted some functions of the UNDO, the Auto option is disabled.
Control
Restricts or turns off the UNDO command.
- All: Turns on all UNDO command.
- None:
Turns off the U and UNDO commands, gives up any information of UNDO in
previous operation. The UNDO button on the Standard toolbar is disabled.
When the None or One is valid, the Auto, BEgin and Mark options are disable.
If you try to use UNDO command under the None status, it displays the following prompt:
Enter an UNDO control option [All/None/One/Combine/Layer] \<All>: - One: Limits the UNDO command as a single operation. When the None or One option is valid, the Auto, BEgin and Mark options are disable. When the One option is valid, the main prompt of the UNDO command is one step of the UNDO and displays control option.
- Combine:
Controls whether to combine multiple and continuous ZOOM and PAN commands
into a single operation for
the UNDO and REDO operations.
Note: The ZOOM and PAN commands that started from the menu are not combined, they are separate actions. - Layer: Controls whether to combine layer dialog operations into a single UNDO operation.
BEgin/ End
Groups a series of operation to a set. Entering the BEgin option, all the
next operations become one part of this set until entering the End option.
When the BEgin option is active, entering the undo begin ends the current set and begins a new one.
If entering undo begin rather than undo end, the number option quits a specified UNDO number and operations from
the beginning.
If users want to go back to operations before the starting point, they must use
the End option (as the set is null). This can also be applied on the U command. The mark made by
the Mark
option is not displayed in UNDO group.
Mark/ Back
The Mark option places a mark in given up information. The Back option gives
up all operations until marked one. If giving up one operation at one time,
there is a notice when the marked operation is given up.
If necessary, users can place any number of marks. Once using the Back option, it returns
back to one mark and deletes the mark. If the specified mark can not be found, the command prompt under the Back option:
This will undo everything. OK? \<Y>
- Y: It gives up all operations.
- N: It ignores this option.
If using number option to give up multiple operations, the UNDO command will stop at the marked one.
Related References：
Related Tasks：