UL(1) User Commands UL(1)
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.
-h, --help
Display help text and exit.
-V, --version
Print version 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)
REPORTING BUGS
For bug reports, use the issue tracker at
https://github.com/util-linux/util-linux/issues.
AVAILABILITY
The ul command is part of the util-linux package which can be
downloaded from Linux Kernel Archive
<https://www.kernel.org/pub/linux/utils/util-linux/>.
util-linux 2.38.1 2022-05-11 UL(1)
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