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.\" 30.Dd October 7, 2020 31.Dt UL 1 32.Os 33.Sh NAME 34.Nm ul 35.Nd do underlining 36.Sh SYNOPSIS 37.Nm 38.Op Fl i 39.Op Fl t Ar terminal 40.Op Ar 41.Sh DESCRIPTION 42The 43.Nm 44utility reads the named files (or standard input if none are given) 45and translates occurrences of underscores to the sequence 46which indicates underlining for the terminal in use, as specified 47by the environment variable 48.Ev TERM . 49The file 50.Pa /etc/termcap 51is read to determine the appropriate sequences for underlining. 52If the terminal is incapable of underlining, but is capable of 53a standout mode then that is used instead. 54If the terminal can overstrike, 55or handles underlining automatically, 56.Nm 57degenerates to 58.Xr cat 1 . 59If the terminal cannot underline, underlining is ignored. 60.Pp 61The following options are available: 62.Bl -tag -width indent 63.It Fl i 64Underlining is indicated by a separate line containing appropriate 65dashes 66.Ql \- . 67.It Fl t Ar terminal 68Overrides the terminal type specified in the environment with 69.Ar terminal . 70.El 71.Sh ENVIRONMENT 72The 73.Ev LANG , LC_ALL , LC_CTYPE 74and 75.Ev TERM 76environment variables affect the execution of 77.Nm 78as described in 79.Xr environ 7 . 80.Sh EXIT STATUS 81.Ex -std 82.Sh SEE ALSO 83.Xr man 1 , 84.Xr mandoc 1 85.Sh HISTORY 86The 87.Nm 88command appeared in 89.Bx 3.0 . 90