Undo

Undoes one or more commands; some commands cannot be undone.

Accessing the Command

command bar: undo

toolbar: Standard |

: undo

Prompts you in the command bar:

Undo: Mark/Back to mark/BEgin set/End set/Control/Auto/<Number of steps to undo>: (Enter the number of commands to undo, or enter an option.)

BricsCAD reports the commands being undone. For example, enter the Customize and then the Units commands. Enter Undo:

Undo: (UNITS)

Undo: (CUSTOMIZE)

Command Options

Option	Description
Number of steps to undo	Specifies the number of commands to undo. Enter a number. Commands are undone sequentially; you cannot skip over commands. Some commands cannot be undone, such as Save, Open, and Plot.
Mark	Sets a marker. The Back to mark option undoes all commands to the marker.
Back to mark	Undoes all commands back to when the marker was set.
BEgin set	Sets the start to a group that groups the following commands. The Undo command treats the commands in the set as a single undo.
End set	Ends the group.
Control	Specifies options; prompts you: Set Undo control: None/One/<All> - enter an option.
None	Turns off the undo mechanism. This is useful when disk space is running low, because the undo mechanism uses disk space.
One	Limits this command to a single undo. This option turns the Undo command into the U command.
All	Turns on the undo mechanism.

Auto	Considers all commands executed by a macro as a single undo.

The Undo control settings are stored in the UNDOCTL system variable, which is saved as a bitcode using the sum of the values of all selected options.

In BricsCAD four options are available:

By default UNDOCTL=5. Since the value of UNDOCTL is not saved, the value is reset to the default with each BricsCAD session.

In AutoCAD two more options exist:

BricsCAD behaves as if those options are ON.

Related Commands

U - undoes the last command.

Redo - redoes the last undone command.

Oops - unerases the last erased object, including newly created blocks.

Zoom - utilizes the Previous option to show the previous view.