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. 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 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, 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.
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
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.
\*U — Version 1.0