ul

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.

       -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)

REPORTING BUGS
       For bug reports, use the issue tracker at
       https://github.com/karelzak/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 2.37.2                 2021-06-02                             UL(1)