2012

Erase
Deletes selected objects. This option provides a convenient method to erase
unneeded objects without leaving the TRIM command.
Undo
Reverses the most recent change made by TRIM.
See also:
Trim or Extend Objects
U Commands
U
Reverses the most recent operation.
Access Methods
Menu: Edit  Undo
Shortcut menu: With no command active and no objects selected, right-click
in the drawing area and click Undo.
Command entry: Cmd-Z
Summary
You can enter u as many times as you wish, backing up one step at a time,
until the drawing is as it was when you began the current editing session.
When an operation cannot be undone, the command name is displayed but
no action is performed. Operations external to the current drawing, such as
plotting or writing to a file, cannot be undone.
If you changed modes or used transparent commands during a command,
their effects are undone, along with the effects of the main command.
The U command is equivalent to entering undo 1.
See also:
Correct Mistakes
Commands | 1071