ul — do underlining
ul [−i] [ −t terminal ] [ name... ]
Ul reads the
named files (or standard input if none are given) and
translates occurrences of underscores to the sequence which
indicates underlining for the terminal in use, as specified
by the environment variable TERM. The terminfo database is read to
determine the appropriate sequences for underlining. If the
terminal is incapable of underlining, but is capable of a
standout mode then that is used instead. If the terminal can
overstrike, or handles underlining automatically,
ul degenerates
to cat(1). If the terminal
cannot underline, underlining is ignored.
The following options are available:
−iUnderlining is indicated by a separate line
containing appropriate dashes `−'; this is useful
when you want to look at the underlining which is
present in an nroff output stream on
a crt-terminal.
−t terminalOverrides the terminal type specified in the
environment with terminal.
The following environment variable is used:
TERMThe TERM variable is
used to relate a tty device with its device capability
description (see terminfo(5)). TERM is set at login time, either by
the default terminal type specified in /etc/ttys or as set during the login
process by the user in their login file (see setenv(1)).
Nroff usually
outputs a series of backspaces and underlines intermixed with
the text to indicate underlining. No attempt is made to
optimize the backward motion.
The command appeared in BSD3.0.
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