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 trans- lates occurrences of underscores to the sequence which indicates underlin- ing 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 ter- minal 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 Display version and exit. ENVIRONMENT The following environment variable is used: TERM The TERM variable is used to relate a tty device with its device capa- bility 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 back- ward motion. SEE ALSO colcrt(1), login(1), man(1), nroff(1), setenv(3), terminfo(5) REPORTING BUGS For bug reports, use the issue tracker <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 2.41.2 2025-09-22 UL(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | HISTORY | BUGS | SEE ALSO | REPORTING BUGS | AVAILABILITY
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