Autocad Command Pedit

Select polyline or [Multiple]: Use an object selection method or enter m
If the selected object is a line or an arc, AutoCAD prompts:
Object selected is not a polyline.
Do you want it to turn into one? : Enter y or n, or press ENTER

AutoCAD Command Stretch

AutoCAD stretches arcs, elliptical arcs, lines, polyline segments, 2D solids, rays, traces, and splines that cross the selection window. STRETCH moves the endpoints that lie inside the window, leaving those outside the window unchanged. STRETCH also moves vertices of traces and 2D solids that lie inside the window and leaves those outside unchanged. Polylines are handled segment by segment, as if they were primitive lines or arcs. STRETCH does not modify 3D solids, polyline width, tangent, or curve-fitting information.

Autocad Command Copyclip

COPYCLIP copies all objects you select to the Clipboard. You can paste the contents of the Clipboard into a document or drawing as an OLE object. Note: You can also use CTRL+C to run COPYCLIP. If the cursor is in the drawing area, AutoCAD copies the selected objects to the Clipboard. If the cursor is on the command line or in the text window, AutoCAD copies the selected text to the Clipboard.

Autocad Array Command

Creates multiple copies of objects in a pattern. Use the Rectangular Array option to create an array defined by a number of rows and columns of copies of the selected object. Use the Polar Array option to create an array by copying the selected objects around a center point.
Specifies the objects used to construct the array. You can select objects before or after the Array dialog box is displayed. To select objects when the Array dialog box is displayed, choose Select Objects. The dialog box temporarily closes. When you finish selecting objects, press ENTER. The Array dialog box is redisplayed, and the number of objects selected is shown below the Select Objects button.