ul — do underlining
ul [options] [ file...
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,
to cat(1). If the terminal
cannot underline, underlining is ignored.
Underlining 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.
Override the environment variable
TERM with the specified terminal type.
Display version information and exit.
Display help text and exit.
The following environment variable is used:
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
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 ul command is part of the util-linux package and is available from Linux Kernel Archive
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(#)ul.1 8.1 (Berkeley) 6/6/93