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UL(1) NetBSD General Commands Manual UL(1)
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ul -- do underlining
ul [-i] [-t terminal] [name ...]
ul reads the named files (or standard input if none are given) and trans-
lates occurrences of underscores to the sequence which indicates under-
lining for the terminal in use, as specified by the environment variable
TERM. The file /usr/share/misc/terminfo is read to determine the appro-
priate sequences for underlining. If the terminal is incapable of under-
lining, 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
The following options are available:
-i Underlining is indicated by a separate line containing appropri-
ate dashes `-'; this is useful when you want to look at the
underlining which is present in an nroff(1) output stream on a
Overrides the terminal type specified in the environment with
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 for example csh(1)'s setenv).
/usr/share/misc/terminfo File containing terminal descriptions.
colcrt(1), man(1), nroff(1), terminfo(3), terminfo(5)
The ul command appeared in 3.0BSD.
nroff(1) usually outputs a series of backspaces and underlines intermixed
with the text to indicate underlining. No attempt is made to optimize
the backward motion.
NetBSD 9.99 June 23, 2016 NetBSD 9.99