Convert Font Family and Text Size of a Document from the Command Line
In addition to being able to convert TXT files to RTF or other filetypes, you can use textutil to convert the font family and font size of a document from the command line.
The syntax for doing this is:
textutil -convert filetype -font fontfamily -fontsize ## filename.txt
For example, to convert file.txt to an RTF document with size 24 Helvetica font, we would use:
textutil -convert rtf -font Helvetica -fontsize 24 file.txt
The conversion is practically instantaneous. Because this is scriptable from the command line, it is potentially more useful than just opening a document in TextEdit and going about this through the GUI, at least for some Mac users.