ul - do underlining

       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 2.40.2                                  2024-01-31                                              UL(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.

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 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.

       ul - do underlining

-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, --terminalterminal
           Override the environment variable TERM with the specified terminal type.

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

colcrt(1), login(1), man(1), nroff(1), setenv(3), terminfo(5)

ul [options] [file...]