To emphasize some text, include it between back quotes: `this text is emphasized`. Emphasized text may appear in italics ( this text is emphasized) or in bold face ( this text is emphasized). (Whether italics or bold face is used depends on the implementation and the output format). This effect requires the use of the -quotefmt command-line option; if the option is not used, back quotes are intrepreted as a simple character. To get a single back-quote when -quotefmt is used, double the quote: ``.