1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)ul.1 8.1 (Berkeley) 6/6/93 29.\" $FreeBSD: head/usr.bin/ul/ul.1 216370 2010-12-11 08:32:16Z joel $ 30.\" 31.Dd December 30, 2013 32.Dt UL 1 33.Os 34.Sh NAME 35.Nm ul 36.Nd do underlining 37.Sh SYNOPSIS 38.Nm 39.Op Fl i 40.Op Fl t Ar terminal 41.Op Ar 42.Sh DESCRIPTION 43The 44.Nm 45utility reads the named files (or standard input if none are given) 46and translates occurrences of underscores to the sequence 47which indicates underlining for the terminal in use, as specified 48by the environment variable 49.Ev TERM . 50The file 51.Pa /etc/termcap 52is read to determine the appropriate sequences for underlining. 53If the terminal is incapable of underlining, but is capable of 54a standout mode then that is used instead. 55If the terminal can overstrike, 56or handles underlining automatically, 57.Nm 58degenerates to 59.Xr cat 1 . 60If the terminal cannot underline, underlining is ignored. 61.Pp 62The following options are available: 63.Bl -tag -width indent 64.It Fl i 65Underlining is indicated by a separate line containing appropriate 66dashes 67.Ql \- ; 68this is useful when you want to look at the underlining 69which is present in an 70.Xr nroff 1 71output stream on a CRT-terminal. 72.It Fl t Ar terminal 73Overrides the terminal type specified in the environment with 74.Ar terminal . 75.El 76.Sh ENVIRONMENT 77The 78.Ev LANG , LC_ALL , LC_CTYPE 79and 80.Ev TERM 81environment variables affect the execution of 82.Nm 83as described in 84.Xr environ 7 . 85.Sh EXIT STATUS 86.Ex -std 87.Sh SEE ALSO 88.Xr colcrt 1 , 89.Xr man 1 , 90.Xr nroff 1 91.Sh HISTORY 92The 93.Nm 94command appeared in 95.Bx 3.0 . 96.Sh BUGS 97The 98.Xr nroff 1 99command usually outputs a series of backspaces and underlines intermixed 100with the text to indicate underlining. 101No attempt is made to optimize 102the backward motion. 103