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converting from one text format to another 
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Convert from one format to another where 
	format = txt, html, rtf, rtfd, doc, docx, wordml, odt, webarchiv

$ textutil -info TSA.dat	#file information 
File:  TSA.dat
  Type:  plain text
  Size:  57980 bytes
  Length:  57980 characters
  Contents:  11/19/2020           907332   ..

$ textutil -convert txt a.html 


On Linux systems use "html2text"