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CAD tip CAD tip # 7812:

Question CAD 
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Q - question

How to write line-feed to a text file in AutoLISP.

A - answer The AutoLISP functions (write-line) and (write-char) automatically add the full CR/LF sequence (carriage return, line feed) when trying to output just the LF (line-feed, chr 10).

There is a trick of forcing AutoCAD to output really just the line-feed. Use the (write-char) function and add 256 to the character code. So instead of (write-char 10 f), use (write-char 266 f). An example:

(setq f (open "C:/TEMP/TESTFILE.TXT" "w"))
(write-char 266 f)
(close f)
writes a file testfile.txt containing just the LF character.
100% *  CAD 
23.2.2011    8197×  
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applies to: AutoCAD 2011 ·

See also:
Tip 12830:Converting pseudo-tables consisting of lines and texts to TABLE objects in AutoCAD DWGs.
Tip 5271:Overview of your complex linetypes.
Tip 2063:How to open a drawing with write-protection (R/O)?

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