HP(1) (Terminal Filters Utilities) HP(1)
NAME
hp - handle special functions of Hewlett-Packard terminals
SYNOPSIS
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. In the
following discussion it should be noted that, unless your
system contains the DOCUMENTER'S WORKBENCH Software,
references to certain commands (e.g., nroff, neqn, equ,
etc.) will not work. A typical usage is in conjunction with
DOCUMENTER'S WORKBENCH 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 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.,
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HP(1) (Terminal Filters Utilities) HP(1)
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.
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
errors.
SEE ALSO
300(1), greek(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.
Page 2 May 1989