1.\" $OpenBSD: ul.1,v 1.15 2010/10/29 08:02:05 jmc Exp $ 2.\" $NetBSD: ul.1,v 1.3 1994/12/07 00:28:23 jtc Exp $ 3.\" 4.\" Copyright (c) 1980, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)ul.1 8.1 (Berkeley) 6/6/93 32.\" 33.Dd $Mdocdate: October 29 2010 $ 34.Dt UL 1 35.Os 36.Sh NAME 37.Nm ul 38.Nd do underlining 39.Sh SYNOPSIS 40.Nm ul 41.Op Fl i 42.Op Fl t Ar terminal 43.Op Ar 44.Sh DESCRIPTION 45.Nm 46reads the named files (or standard input if none are given) 47and translates occurrences of underscores to the sequence 48which indicates underlining for the terminal in use, as specified 49by the environment variable 50.Ev TERM . 51The file 52.Pa /etc/termcap 53is read to determine the appropriate sequences for underlining. 54If the terminal is incapable of underlining, but is capable of 55a standout mode, then that is used instead. 56If the terminal can overstrike, 57or handles underlining automatically, 58.Nm 59degenerates to 60.Xr cat 1 . 61If the terminal cannot underline, underlining is ignored. 62.Pp 63The options are as follows: 64.Bl -tag -width Ds 65.It Fl i 66Underlining is indicated by a separate line containing appropriate 67dashes 68.Pq Ql - . 69.It Fl t Ar terminal 70Overrides the terminal type specified in the environment with 71.Ar terminal . 72.El 73.Sh ENVIRONMENT 74.Bl -tag -width TERM 75.It Ev TERM 76Used to relate a tty device 77with its device capability description (see 78.Xr termcap 5 ) . 79.Ev TERM 80is set at login time, either by the default terminal type 81specified in 82.Pa /etc/ttys 83or as set during the login process by the user in their 84.Pa login 85file (see 86.Xr environ 7 ) . 87.El 88.Sh SEE ALSO 89.Xr man 1 90.Sh HISTORY 91The 92.Nm 93command appeared in 94.Bx 3.0 . 95