How to Add Comments to an AutoCAD Script (.scr) File

Last updated: September 25, 2026

Short answer: start the line with a semicolon (;). AutoCAD skips any line in a script file whose first character is a semicolon.

Example

;Batch cleanup script
;Zoom to extents
ZOOM
E
;Purge everything unused, with no prompts
-PURGE
A
*
N
;End of script

Rules for comments in AutoCAD scripts

• The semicolon must be the first character on the line. Put each comment on its own line, above the command it describes.
• Don't add a comment after a command on the same line. AutoCAD reads the whole line as input, so ZOOM ;zoom out sends ";zoom" and "out" to the ZOOM prompt and the rest of the script goes out of step.
• Comment lines can go anywhere else: at the top as a header, between commands, or at the end.

3 script gotchas that silently break batch runs

• A blank line is an Enter. At the Command prompt, Enter repeats the last command. Use a comment line, not an empty line, to space out your script.
• A space is an Enter too. Invisible trailing spaces at the end of a line send extra Enters. Check for them when a script gets out of step.
• End the last line with a line break. If the file stops right after the last command, that command may not run.

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Related: AutoCAD Commands List (which commands are safe in scripts)  |  AutoCAD System Variables List (FILEDIA, CMDECHO and other script settings)  |  AutoCAD Batch Scripting Cheat Sheet