UL
Section: User Commands (1)
Updated: September 2011
Page Index
NAME
ul - do underlining
SYNOPSIS
ul [options]
[
file...]
DESCRIPTION
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.
OPTIONS
- -i, --indicated
-
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.
- -t, -T, --terminal terminal
-
Override the environment variable
TERM
with the specified
terminal
type.
- -V, --version
-
Display version information and exit.
- -h, --help
-
Display help text and exit.
ENVIRONMENT
The following environment variable is used:
- TERM
-
The
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(3)).
HISTORY
The
ul
command appeared in 3.0BSD.
BUGS
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.
SEE ALSO
colcrt(1),
login(1),
man(1),
nroff(1),
setenv(3),
terminfo(5)
AVAILABILITY
The ul command is part of the util-linux package and is available from
Linux Kernel Archive