Basic Commands for drawing and modifying the drawing

1. LINE

 Command:  L ↵

 The first command we will look at drawing straight lines. Each line has a beginning and an           ending point and the program wants you to specify the beginning point of the line. You enter the beginning point by either typing the point coordinates at the keyboard or by clicking the mouse on a location of the screen where you want the line to begin.

2.ERASE

Command: E↵

This removes a selected group of entities, which may be entered before or after the command itself is entered.

3.Redo: 

Command: Ctrl+y

This command is used immediately after an error to redo what was undone

4.Undo:

Command: Ctrl+z

It is able to undo several commands at once, allows the user to set mark points and later undo back to those points, and to group operations together and undo them simultaneously.

5.Grid: Command: F7

This command sets up a visible grid of white dots that is used for referencing purposes.