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-.\" $OpenBSD: colcrt.1,v 1.13 2007/05/31 19:20:08 jmc Exp $
-.\" $NetBSD: colcrt.1,v 1.3 1995/03/26 05:30:59 glass Exp $
-.\"
-.\" Copyright (c) 1980, 1990, 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:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" 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
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. 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
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" @(#)colcrt.1 8.1 (Berkeley) 6/30/93
-.\"
-.Dd $Mdocdate: May 31 2007 $
-.Dt COLCRT 1
-.Os
-.Sh NAME
-.Nm colcrt
-.Nd filter nroff output
-.Sh SYNOPSIS
-.Nm colcrt
-.Op Fl
-.Op Fl 2
-.Op Ar
-.Sh DESCRIPTION
-.Nm
-provides virtual half-line and reverse line feed sequences
-for terminals without such capability, and on which overstriking
-is destructive.
-Half-line characters and underlining (changed to dashing
-.Sq - )
-are placed on new lines in between the normal output lines.
-.Pp
-The options are as follows:
-.Bl -tag -width Ds
-.It Fl
-Suppress all underlining.
-This option is especially useful for previewing
-.Em allboxed
-tables from
-.Xr tbl 1 .
-.It Fl 2
-Causes all half-lines to be printed, effectively double spacing the output.
-Normally, a minimal space output format is used which will suppress empty
-lines.
-The program never suppresses two consecutive empty lines, however.
-The
-.Fl 2
-option is useful for sending output to the line printer when the output
-contains superscripts and subscripts which would otherwise be invisible.
-.El
-.Sh EXAMPLES
-A typical use of
-.Nm
-would be:
-.Bd -literal -offset indent
-$ tbl exum2.n | nroff -ms | colcrt - | more
-.Ed
-.Sh SEE ALSO
-.Xr col 1 ,
-.Xr more 1 ,
-.Xr nroff 1 ,
-.Xr troff 1 ,
-.Xr ul 1
-.Sh HISTORY
-The
-.Nm
-command appeared in
-.Bx 3.0 .
-.Sh BUGS
-Should fold underlines onto blanks even with the
-.Sq Fl
-option so that
-a true underline character would show.
-.Pp
-Can't back up more than 102 lines.
-.Pp
-General overstriking is lost;
-as a special case
-.Ql |
-overstruck with
-.Ql -
-or underline becomes
-.Ql + .
-.Pp
-Lines are trimmed to 132 characters.
-.Pp
-Some provision should be made for processing superscripts and subscripts
-in documents which are already double-spaced.