


      HP(1)                         (DWB)                         HP(1)



      NAME
           hp - handle special functions of HP 2640 and 2621-series
           terminals

      SYNTAX
           hp [ -e ] [ -m ]

      DESCRIPTION
           Hp supports special functions of the Hewlett-Packard 2640
           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 your 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.

           The flags are as follows:
           -e   It is assumed that your terminal has the ``display
                enhancements'' feature, and so maximal use is made 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, i.e., dark-on-light, rather than
                the usual light-on-dark.
           -m   Requests minimization of output by removal of new-
                lines.  Any contiguous sequence of 3 or more new-lines
                is converted into a sequence of only 2 new-lines; i.e.,
                any number of successive blank lines produces only a
                single blank output line.  This allows you to retain
                more actual text on the screen.

           With regard to Greek and other special characters, hp
           provides the same set as does 300(1), except that ``not'' is
           approximated by a right arrow, and only the top half of the
           integral sign is shown.  The display is adequate for
           examining output from neqn.

      DIAGNOSTICS
           ``line too long'' if the representation of a line exceeds
           1,024 characters.
           The exit codes are 0 for normal termination, 2 for all



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      HP(1)                         (DWB)                         HP(1)



           errors.

      SEE ALSO
           300(1), col(1), eqn(1), greek(1), nroff(1), tbl(1).

      BUGS
           An ``overstriking sequence'' is defined as a printing
           character 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(1) 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(1).
           Although some terminals do provide numerical superscript
           characters, no attempt is made to display them.


































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