hp(1)hp(1)NAMEhp - handle special functions of HP2640 and HP2621-series terminals
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 output. A typical use is:
Regardless of the hardware options on a given terminal, tries to do
sensible things with underlining and reverse line-feeds. If the termi‐
nal has the ``display enhancements'' feature, subscripts and super‐
scripts can be indicated in distinct ways. If it has the ``mathemati‐
cal-symbol'' feature, Greek and other special characters can be dis‐
recognizes the following options:
Specify that your terminal has the ``display enhancements'' fea‐
to make maximal use of the added display modes. Over‐
struck characters are presented in the Underline mode.
Superscripts are shown in Half-bright mode, and sub‐
scripts in Half-bright, Underlined mode. If this flag
is omitted, 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 light-on-dark.
Request minimization of output by removing new-lines.
Any contiguous sequence of 3 or more new-lines is con‐
verted 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.
The representation of a line exceeds 1,024 characters.
returns zero for normal termination, and 2 for all errors.
An ``overstriking sequence'' is defined as a printing character fol‐
lowed 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 partic‐
ular, tables generated by that contain vertical lines will often be
missing the lines of text that contain the ``foot'' of a vertical line,
unless the input to is piped through (see col(1)).
Although some terminals do support numerical superscript characters, no
attempt is made to display them.
SEE ALSOcol(1), neqn(1), nroff(1), tbl(1).