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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)ul.1 8.1 (Berkeley) 6/6/93 33.\" $FreeBSD: src/usr.bin/ul/ul.1,v 1.6.2.4 2002/06/21 15:29:52 charnier Exp $ 34.\" $DragonFly: src/usr.bin/ul/ul.1,v 1.4 2006/04/17 18:01:38 swildner Exp $ 35.\" 36.Dd June 6, 1993 37.Dt UL 1 38.Os 39.Sh NAME 40.Nm ul 41.Nd do underlining 42.Sh SYNOPSIS 43.Nm 44.Op Fl i 45.Op Fl t Ar terminal 46.Op Ar name Ar ... 47.Sh DESCRIPTION 48The 49.Nm 50utility reads the named files (or standard input if none are given) 51and translates occurrences of underscores to the sequence 52which indicates underlining for the terminal in use, as specified 53by the environment variable 54.Ev TERM . 55The file 56.Pa /etc/termcap 57is read to determine the appropriate sequences for underlining. 58If the terminal is incapable of underlining, but is capable of 59a standout mode then that is used instead. 60If the terminal can overstrike, 61or handles underlining automatically, 62.Nm 63degenerates to 64.Xr cat 1 . 65If the terminal cannot underline, underlining is ignored. 66.Pp 67The following options are available: 68.Bl -tag -width Ds 69.It Fl i 70Underlining is indicated by a separate line containing appropriate 71dashes `\-'; this is useful when you want to look at the underlining 72which is present in an 73.Xr nroff 1 74output stream on a crt-terminal. 75.It Fl t Ar terminal 76Overrides the terminal type specified in the environment with 77.Ar terminal . 78.El 79.Sh ENVIRONMENT 80The following environment variable is used: 81.Bl -tag -width TERM 82.It Ev TERM 83The 84.Ev TERM 85variable is used to relate a tty device 86with its device capability description (see 87.Xr termcap 5 ) . 88.Ev TERM 89is set at login time, either by the default terminal type 90specified in 91.Pa /etc/ttys 92or as set during the login process by the user in their 93.Pa login 94file (see 95.Xr environ 7 ) . 96.El 97.Sh SEE ALSO 98.Xr colcrt 1 , 99.Xr man 1 , 100.Xr nroff 1 101.Sh HISTORY 102The 103.Nm 104command appeared in 105.Bx 3.0 . 106.Sh BUGS 107The 108.Xr nroff 1 109command usually outputs a series of backspaces and underlines intermixed 110with the text to indicate underlining. No attempt is made to optimize 111the backward motion. 112