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
-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
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