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 hp(1)								       hp(1)

      hp - handle special functions of HP2640 and HP2621-series terminals

      hp [-e] [-m]

      hp supports special functions of the Hewlett-Packard HP 2640 and HP
      2621 series of terminals, with the primary purpose of producing
      accurate representations of most nroff output.  A typical use is:

	   nroff -h files ... | hp

      Regardless of the hardware options on a given terminal, hp tries to do
      sensible things with underlining and reverse line-feeds.	If the
      terminal has the ``display enhancements'' feature, subscripts and
      superscripts can be indicated in distinct ways.  If it has the
      ``mathematical-symbol'' feature, Greek and other special characters
      can be displayed.

      hp recognizes the following options:

	   -e	     Specify that your terminal has the ``display
		     enhancements'' feature, to make maximal use of the
		     added display modes.  Overstruck characters are
		     presented in the Underline mode.  Superscripts are
		     shown in Half-bright mode, and subscripts in Half-
		     bright, Underlined mode.  If this flag is omitted, hp
		     assumes that your terminal lacks the ``display
		     enhancements'' feature.  In this case, all overstruck
		     characters, subscripts, and superscripts are displayed
		     in Inverse Video mode; that is, dark-on-light, rather
		     than light-on-dark.

	   -m	     Request minimization of output by removing new-lines.
		     Any contiguous sequence of 3 or more new-lines is
		     converted into a sequence of only 2 new-lines; that is,
		     any number of successive blank lines produces only a
		     single blank output line.	This allows you to retain
		     more actual text on the screen.

      line too long
	   The representation of a line exceeds 1,024 characters.

      hp returns zero for normal termination, and 2 for all errors.

      An ``overstriking sequence'' is defined as a printing character

 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000

 hp(1)								       hp(1)

      followed by a backspace followed by another printing character.  In
      such sequences, if either printing character is an underscore, the
      other printing character is shown underlined or in Inverse Video;
      otherwise, only the first printing character is shown (again,
      underlined or in Inverse Video).	Nothing special is done if a
      backspace is adjacent to an ASCII control character.  Sequences of
      control characters (e.g., reverse line-feeds, backspaces) can make
      text ``disappear''; in particular, tables generated by tbl that
      contain vertical lines will often be missing the lines of text that
      contain the ``foot'' of a vertical line, unless the input to hp is
      piped through col (see col(1)).

      Although some terminals do support numerical superscript characters,
      no attempt is made to display them.

      col(1), neqn(1), nroff(1), tbl(1).

 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000