Manipulate text files of various formats. More information: https://keith.github.io/xcode-man-pages/textutil.1.html.
foo.rtf:textutil -info path/to/foo.rtf
foo.rtf into foo.html:textutil -convert html path/to/foo.rtf
textutil path/to/foo.rtf -convert txt
foo.txt into foo.rtf, using Times 10 for the font:textutil -convert rtf -font Times -fontsize 10 path/to/foo.txt
index.html with the HTML title set to “Several Files”:textutil -cat html -title "Several Files" -output path/to/index.html *.rtf