hp(C)
hp --
handle special functions of Hewlett-Packard terminals
Syntax
hp
[
-e
] [
-m
]
Description
hp
supports the special functions of the Hewlett-Packard 2640
series of terminals,
with the primary purpose of producing accurate representations of most
nroff
output.
A typical usage is in conjunction with text processing
software:
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 Underlined 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 the usual
light-on-dark.
-m-
Requests minimization of output by changing new-lines to ^M's.
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.
With regard to Greek and other special characters,
hp
provides the same set as
300(C)
,
except that ``not'' is approximated by a right arrow,
and only the top half of
the integral sign is shown.
Diagnostics
line too long-
The line is too long if the representation of a line exceeds 1,024 characters.
The exit codes are
0
for normal termination,
2
for all errors.
Limitations
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 (for example, 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(C).
Although some terminals do provide numerical superscript characters,
no attempt is made to display them.
See also
300(C),
greek(C)
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003