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.Dd October 7, 2020 29.Dt UL 1 30.Os 31.Sh NAME 32.Nm ul 33.Nd do underlining 34.Sh SYNOPSIS 35.Nm 36.Op Fl i 37.Op Fl t Ar terminal 38.Op Ar 39.Sh DESCRIPTION 40The 41.Nm 42utility reads the named files (or standard input if none are given) 43and translates occurrences of underscores to the sequence 44which indicates underlining for the terminal in use, as specified 45by the environment variable 46.Ev TERM . 47The file 48.Pa /etc/termcap 49is read to determine the appropriate sequences for underlining. 50If the terminal is incapable of underlining, but is capable of 51a standout mode then that is used instead. 52If the terminal can overstrike, 53or handles underlining automatically, 54.Nm 55degenerates to 56.Xr cat 1 . 57If the terminal cannot underline, underlining is ignored. 58.Pp 59The following options are available: 60.Bl -tag -width indent 61.It Fl i 62Underlining is indicated by a separate line containing appropriate 63dashes 64.Ql \- . 65.It Fl t Ar terminal 66Overrides the terminal type specified in the environment with 67.Ar terminal . 68.El 69.Sh ENVIRONMENT 70The 71.Ev LANG , LC_ALL , LC_CTYPE 72and 73.Ev TERM 74environment variables affect the execution of 75.Nm 76as described in 77.Xr environ 7 . 78.Sh EXIT STATUS 79.Ex -std 80.Sh SEE ALSO 81.Xr man 1 , 82.Xr mandoc 1 83.Sh HISTORY 84The 85.Nm 86command appeared in 87.Bx 3.0 . 88