AutoCAD’s LIST or PROPERTIES commands give you data per object. To get a total length of 100 line segments representing a road edge or a cable tray, you must:
Several versions are hosted as code snippets, such as this TLEN.lsp Gist which allows you to copy the raw code directly. autocad tlenlsp download free
You can download or copy the source code for tlen.lsp from several reputable community sources: AutoCAD’s LIST or PROPERTIES commands give you data
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