Useful Commands

Command	Description
AUDIT	Will fix any errors within the .DWG, can fix the “one or more objects cannot be saved…” problem.
MAPCLEAN	Clean up the drawing/delete zero length objects/remove duplicates/etc.
OVERKILL	Remove duplicate objects.
PURGE	Purge objects/data from the drawing.
CLIPIT	Clip an image to a polyline.
COPYTOLAYER	Copy objects to another layer.
ACEATTACHDATA	Attach data to objects
MAPEXPORT	Export DSpec objects to .mif/.tab
TEXTMASK	Add background mask to text
LAYMRG	Merge AutoCAD layers
OSNAPZ	Set to 1 to ignore elevations when snapping to objects (default = 0)
DIVIDE	Divides selected object into evenly sized lengths
DYNMODE	Setting to 0 stops commands from appearing next to the cursor/crosshair
FLATTEN	Convert 3D to 2D objects (and ungroup multiple objects).
_MAPTRIM	Trim all objects within a selected (or defined) boundary. Unsure if this works for Feature Lines.
VISUALSTYLES	Open the Visual Styles Manager, where you can use the Highlight Intensity setting under Lighting, in your selected Visual Style to modify how bright the object viewer’s surface lighting is.
TRIMEXTENDMODE	Set to 0 when the Extend command is in quick mode (1). When in standard mode (0), you may select the boundaries first, then the object to extend.
MAPSTATUSBAR	Show or Hide the Map status bar (access to projection library)
MINIMUMDISTBETWEENSURFACES	Draws a 3D polyline along intersections of two surfaces
EDITFEATURECURVE	Allows you to delete a curve from feature lines.
POINT	Create a non-COGO point. Use this for ASPEC stuff.
INPUTSEARCHOPTIONS	Customise the auto-complete options for command suggestions.
INPUTSEARCHDELAY	Change the delay before command suggestions are shown.
RENAME	Rename blocks, or any named object.
ZC	Zoom Centre – Use to manually set coordinates of a viewport.
LINEWORKSHRINKWRAP	Draws a shrink-wrapped outline around any collections of contiguous linework entities. Note: 3D Faces (and probably other 3D objects) throws it off.
IMAGEQUALITY	Change the quality of Raster Images. Set to High to turn on Anti-Aliasing (smoothing, eg. When zoomed in), or Draft to turn AA off.
OOPS	Restore the last deleted element (even if other commands have been input since)
TEXTTOFRONT	Brings all text in front of all other objects in drawing.
HATCHTOBACK	Sets draw order of all hatches to behind all other objects.
NCOPY	Copy an element from an XREF into the current drawing.
TORIENT	Text Orient: Rotate text/MText/Block Attributes to a specified angle of rotation.