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125 lines
3.8 KiB
Groff
125 lines
3.8 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)colcrt.1 8.1 (Berkeley) 6/30/93
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.\" $FreeBSD$
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.\"
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.Dd July 31, 2004
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.Dt COLCRT 1
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.Os
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.Sh NAME
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.Nm colcrt
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.Nd filter nroff output for CRT previewing
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.Sh SYNOPSIS
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.Nm
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.Op Fl
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.Op Fl \&2
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility provides virtual half-line and reverse line feed sequences
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for terminals without such capability, and on which overstriking
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is destructive.
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Half-line characters and underlining (changed to dashing `\-')
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are placed on new lines in between the normal output lines.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl
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Suppress all underlining.
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This option is especially useful for previewing
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.Em allboxed
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tables from
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.Xr tbl 1 .
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.It Fl 2
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Cause all half-lines to be printed, effectively double spacing the output.
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Normally, a minimal space output format is used which will suppress empty
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lines.
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The program never suppresses two consecutive empty lines, however.
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The
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.Fl 2
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option is useful for sending output to the line printer when the output
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contains superscripts and subscripts which would otherwise be invisible.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG , LC_ALL
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and
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.Ev LC_CTYPE
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environment variables affect the execution of
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.Nm
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as described in
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.Xr environ 7 .
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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A typical use of
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.Nm
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would be
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.Bd -literal
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tbl exum2.n \&| nroff \-ms \&| colcrt \- \&| more
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.Ed
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.Sh SEE ALSO
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.Xr col 1 ,
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.Xr more 1 ,
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.Xr nroff 1 ,
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.Xr troff 1 ,
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.Xr ul 1
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 3.0 .
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.Sh BUGS
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Should fold underlines onto blanks even with the
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.Sq Fl
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option so that
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a true underline character would show.
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.Pp
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Cannot back up more than 102 lines.
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.Pp
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General overstriking is lost;
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as a special case
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.Ql \&|
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overstruck with
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.Ql \-
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or underline becomes
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.Ql \&+ .
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.Pp
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Lines are trimmed to 132 characters.
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.Pp
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Some provision should be made for processing superscripts and subscripts
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in documents which are already double-spaced.
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.Pp
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Characters that take up more than one column position may not be
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underlined correctly.
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