GNU Info

(texinfo)emph & strong

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`@emph'{TEXT} and `@strong'{TEXT}
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  The `@emph' and `@strong' commands are for emphasis; `@strong' is
stronger.  In printed output, `@emph' produces _italics_ and `@strong'
produces *bold*.

  For example,

     @quotation
     @strong{Caution:} @samp{rm * .[^.]*} removes @emph{all}
     files in the directory.
     @end quotation

produces:

          *Caution*: `rm * .[^.]*' removes _all_
          files in the directory.

  The `@strong' command is seldom used except to mark what is, in
effect, a typographical element, such as the word `Caution' in the
preceding example.

  In the Info output, `@emph' surrounds the text with underscores
(`_'), and `@strong' puts asterisks around the text.

     *Caution:* Do not use `@strong' with the word `Note'; Info will
     mistake the combination for a cross reference.  Use a phrase such
     as *Please note* or *Caution* instead.