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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | HISTORY | BUGS | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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UL(1) User Commands UL(1)
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, ul degenerates to cat(1). If
the terminal cannot underline, underlining is ignored.
-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
Display version and exit.
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)).
The ul command appeared in 3.0BSD.
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.
colcrt(1), login(1), man(1), nroff(1), setenv(3), terminfo(5)
For bug reports, use the issue tracker
<https://github.com/util-linux/util-linux/issues>.
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/>. This page is
part of the util-linux (a random collection of Linux utilities)
project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2025-08-11. (At that time, the date of the most recent commit that
was found in the repository was 2025-08-05.) If you discover any
rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
util-linux 2.42-start-521-ec46 2025-08-09 UL(1)
Pages that refer to this page: colcrt(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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