freebsd-nq/usr.bin/ul/ul.1

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.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" @(#)ul.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd August 4, 2004
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.Dt UL 1
.Os
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.Sh NAME
.Nm ul
.Nd do underlining
.Sh SYNOPSIS
.Nm
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.Op Fl i
.Op Fl t Ar terminal
.Op Ar
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.Sh DESCRIPTION
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The
.Nm
utility reads the named files (or standard input if none are given)
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and translates occurrences of underscores to the sequence
which indicates underlining for the terminal in use, as specified
by the environment variable
.Ev TERM .
The file
.Pa /etc/termcap
is read to determine the appropriate sequences for underlining.
If the terminal is incapable of underlining, but is capable of
a standout mode then that is used instead.
If the terminal can overstrike,
or handles underlining automatically,
.Nm
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degenerates to
.Xr cat 1 .
If the terminal cannot underline, underlining is ignored.
.Pp
The following options are available:
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.Bl -tag -width indent
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.It Fl i
Underlining is indicated by a separate line containing appropriate
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dashes
.Ql \- ;
this is useful when you want to look at the underlining
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which is present in an
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.Xr nroff 1
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output stream on a CRT-terminal.
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.It Fl t Ar terminal
Overrides the terminal type specified in the environment with
.Ar terminal .
.El
.Sh ENVIRONMENT
The
.Ev LANG , LC_ALL , LC_CTYPE
and
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.Ev TERM
environment variables affect the execution of
.Nm
as described in
.Xr environ 7 .
.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr colcrt 1 ,
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.Xr man 1 ,
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.Xr nroff 1
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.Sh HISTORY
The
.Nm
command appeared in
.Bx 3.0 .
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.Sh BUGS
The
.Xr nroff 1
command usually outputs a series of backspaces and underlines intermixed
with the text to indicate underlining.
No attempt is made to optimize
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the backward motion.