textutil

Manipulate text files of various formats. More information: https://keith.github.io/xcode-man-pages/textutil.1.html.

textutil -info path/to/foo.rtf

textutil -convert html path/to/foo.rtf

textutil path/to/foo.rtf -convert txt

textutil -convert rtf -font Times -fontsize 10 path/to/foo.txt

textutil -cat html -title "Several Files" -output path/to/index.html *.rtf