Commands used in CAD development

Basic Drawing and Editing Commands

1. LINE - Draw a straight line between two points.
2. CIRCLE - Draw a circle by specifying the center and radius.
3. ARC - Draw an arc by specifying the start, center, and angle or radius.
4. RECTANGLE - Draw a rectangle by defining two opposite corners.
5. POLYLINE (PLINE) - Draw a connected series of line segments or arcs.
6. SPLINE - Create a smooth curve through multiple control points.
7. ELLIPSE - Draw an ellipse using center, major, and minor axes.
8. POINT - Place a point at a specified coordinate.
9. TEXT - Insert single-line text.
10. MTEXT - Insert multi-line text with formatting.
11. DIMLINEAR - Create linear dimensions (horizontal/vertical).
12. DIMANGULAR - Create angular dimensions.
13. DIMDIAMETER - Dimension the diameter of a circle.
14. DIMRADIUS - Dimension the radius of a circle or arc.
15. HATCH - Fill an enclosed area with a pattern or solid fill.
16. LEADER - Add a leader line with text to annotate a drawing.
17. TOLERANCE - Add tolerance annotations to dimensions.
18. BOM (Bill of Materials) - Generate a bill of materials for parts in a drawing.
19. MIRROR - Mirror objects about a specified axis.
20. ROTATE - Rotate an object around a specified point.
21. MOVE - Move an object from one location to another.
22. SCALE - Scale an object by a factor from a base point.
23. COPY - Create a duplicate of an object.
24. TRIM - Trim objects to meet the edges of other objects.
25. EXTEND - Extend objects to meet the edges of other objects.
26. OFFSET - Create a parallel copy of an object at a specified distance.
27. FILLET - Round the corners of two objects.
28. CHAMFER - Bevel the edges of two objects.
29. JOIN - Combine two or more objects into a single object.
30. EXPLODE - Break down a compound object into individual elements.
31. ARRAY - Create a patterned copy of objects in a rectangular, polar, or path arrangement.
32. SPLIT - Divide an object into two parts at a specified location.
33. CONVERTTO3D - Convert a 2D object into a 3D shape.

3D Modeling Commands

1. EXTRUDE - Create a 3D object by extruding a 2D shape along a path.
2. REVOLVE - Create a 3D object by revolving a 2D profile around an axis.
3. LOFT - Create a 3D object by blending between multiple 2D profiles.
4. SWEEP - Create a 3D object by sweeping a 2D shape along a 3D path.
5. BOOLEAN - Perform Boolean operations (union, subtraction, intersection) on solids.
6. THICKEN - Turn a 2D surface into a 3D solid by adding thickness.
7. FILLETEDGE - Apply a fillet to the edge of a 3D solid.
8. CHAMFEREDGE - Apply a chamfer to the edge of a 3D solid.
9. SHELL - Hollow out a 3D solid by defining a thickness.
10. SPLITFACE - Split a 3D surface into two regions.
11. CLOTH - Apply a cloth simulation to a 3D model (if supported).
12. THINWALL - Create thin-walled geometry for 3D models.

Modification and Transformation Commands

1. ALIGN - Align selected objects with others by specifying alignment points.
2. STRETCH - Stretch objects in one direction while maintaining others.
3. SCALE - Resize an object or group by a specified factor.
4. GRIPEDIT - Modify objects directly by using their grips.
5. MIRROR3D - Mirror a 3D object across a plane.
6. FILLET3D - Apply a 3D fillet between two surfaces or edges.
7. MATCHPROP - Copy properties from one object to another.
8. REGEN - Regenerate the drawing to update the display.

View and Navigation Commands

1. ZOOM - Adjust the view scale in a drawing (in, out, extents, window).
2. PAN - Move the view of the drawing area without changing the zoom level.
3. VIEW - Save or restore a named view.
4. VPOINT - Define the viewpoint in 3D space (for 3D navigation).
5. 3DORBIT - Rotate the view of a 3D model interactively.
6. PLAN - Switch to a top-down view of the drawing.
7. ISOMETRICVIEW - Switch to an isometric view.
8. UCS - Set a custom User Coordinate System for drawing in 3D space.
9. ORBIT - Freeform 3D navigation by dragging the model with the mouse.
10. CLIP - Create a viewable clipping region to hide parts of a model.
11. SECTION - Display a section view of a 3D object or model.
12. CUT - Create a sectional view in a 3D model.

Layer and Object Properties

1. LAYER - Manage layers in a drawing, including creating, modifying, and setting properties.
2. LAYERSTATE - Save or restore a set of layer properties.
3. LAYON - Turn on a layer.
4. LAYOFF - Turn off a layer.
5. LAYERFREEZE - Freeze a layer to improve performance.
6. LAYERTHAW - Thaw a frozen layer.
7. SETLAYER - Assign objects to specific layers.
8. LAYERMANAGER - Open the Layer Properties Manager for advanced layer management.
9. COLOR - Change the color of objects or layers.
10. LINETYPE - Define or change the line type of objects or layers.
11. LINETHICKNESS - Adjust the thickness of object lines.

Annotation and Documentation

1. TEXTSTYLE - Create or modify text styles.
2. DIMSTYLE - Create or modify dimension styles.
3. TOLERANCE - Apply tolerance to dimensions.
4. LEADER - Add leader lines with text to annotate drawings.
5. MULTILEADER - Add multiple leader lines with text.
6. BOM - Insert a Bill of Materials table in the drawing.
7. WBLOCK - Create a block from selected objects and save it to a file.
8. BLOCK - Create a block from selected objects for reuse.
9. INSERT - Insert a block or external drawing into the current drawing.
10. MINSERT - Insert multiple instances of a block with a pattern.

Data Management and Collaboration

1. XREF - Attach an external reference (X ref) to a drawing file.
2. REFERENCES - Manage external references, such as X refs, images, and PDFs.
3. PUBLISH - Publish a drawing to a PDF, DWF, or other file formats.
4. EXPORT - Export a drawing to a different file format (e.g., DXF, SVG, STL).
5. IMPORT - Import data from other file formats (e.g., DXF, STEP, IGES).
6. ATTDEF - Define attributes for blocks (e.g., part number, description).
7. ATTEDIT - Edit the attributes of a block reference.
8. FIELD - Insert a dynamic field that updates with drawing or system data.
9. REMARKS - Add comments or remarks to an object or design.

Simulation and Analysis

1. MESH - Create a mesh body from a solid object.
2. SIMULATE - Run a simulation (for mechanical, thermal, or fluid analysis, if supported).
3. FINITEELEMENT - Perform finite element analysis (FEA) on a model.
4. SIMULATIONRESULTS - View and manage simulation results.
5. KINEMATIC - Simulate the motion of mechanical systems.

Miscellaneous and Utility Commands

1. UNDO - Undo the previous operation.
2. REDO - Redo the undone operation.
3. SAVE - Save the current drawing.
4. RECOVER - Recover a corrupted drawing file.
5. BACKUP - Create a backup copy of the drawing.
6. PLOT - Print or plot the current drawing.
7. DWGCONVERT - Convert a drawing file to a different version of DWG format.
8. EXPORTTOAUTOCAD - Export an assembly or part to a DWG file.
9. ADDREWRITE - Apply changes to a drawing or model by replacing parts of the design.
10. CALCULATE - Perform mathematical operations within the drawing or model.

Advanced/Custom Commands (Programming and Scripting)

1. LISP - Load and run Auto LISP scripts for custom commands and automation.
2. SCRIPT - Run a sequence of commands stored in a text file (automated operations).
3. VBA - Execute VBA (Visual Basic for Applications) macros for automation.
4. .NET - Use .NET programming to create custom applications and commands within CAD.
5. API - Use CAD-specific APIs (Application Programming Interfaces) to interact with software and develop custom tools.

From simple drawing and 3D modeling to sophisticated customization and teamwork tools, these commands cover a broad range of tasks. Although the precise commands you can use will vary depending on the CAD platform you're using (AutoCAD, SolidWorks, Fusion 360, Rhino, etc.), these broad categories and commands ought to work with the majority of CAD programs.