Re: troff | less

le gras est obtenu en faisant suivre chaque lettre par un retour arrière puis un second exemplaire d'elle-même, et le soulignement en faisant suivre chaque lettre par un retour arrière puis un tiret bas

En fait c'est beaucoup plus riche que ça, puisque les codes de contrôle ANSI sont utilisés par certaines version pour obtenir des vraies italiques ou des couleurs (le support dépend bien-sûr du terminal). Je ne sais pas comment le faire, mais je l'ai déjà vu, promis, juré.

On peut demander à less d'interpréter différemment ces codes de contrôle, je recopie la documentation des options -r et -R (à afficher en cinémascope ☺):

-r or --raw-control-chars
 Causes "raw" control characters to be displayed. The default is
 to display control characters using the caret notation; for
 example, a control-A (octal 001) is displayed as "^A". Warning:
 when the -r option is used, less cannot keep track of the actual
 appearance of the screen (since this depends on how the screen
 responds to each type of control character). Thus, various dis-
 play problems may result, such as long lines being split in the
 wrong place.
-R or --RAW-CONTROL-CHARS
 Like -r, but only ANSI "color" escape sequences are output in
 "raw" form. Unlike -r, the screen appearance is maintained cor-
 rectly in most cases. ANSI "color" escape sequences are
 sequences of the form:
 ESC [ ... m
 where the "..." is zero or more color specification characters
 For the purpose of keeping track of screen appearance, ANSI
 color escape sequences are assumed to not move the cursor. You
 can make less think that characters other than "m" can end ANSI
 color escape sequences by setting the environment variable
 LESSANSIENDCHARS to the list of characters which can end a color
 escape sequence. And you can make less think that characters
 other than the standard ones may appear between the ESC and the
 m by setting the environment variable LESSANSIMIDCHARS to the