1.\" $NetBSD: colcrt.1,v 1.7 2001/12/01 18:57:03 wiz Exp $ 2.\" 3.\" Copyright (c) 1980, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)colcrt.1 8.1 (Berkeley) 6/30/93 35.\" 36.Dd June 30, 1993 37.Dt COLCRT 1 38.Os 39.Sh NAME 40.Nm colcrt 41.Nd filter nroff output for CRT previewing 42.Sh SYNOPSIS 43.Nm 44.Op Fl 45.Op Fl \&2 46.Op Ar 47.Sh DESCRIPTION 48.Nm 49provides virtual half-line and reverse line feed sequences 50for terminals without such capability, and on which overstriking 51is destructive. 52Half-line characters and underlining (changed to dashing `\-') 53are placed on new lines in between the normal output lines. 54.Pp 55Available options: 56.Bl -tag -width Ds 57.It Fl 58Suppress all underlining. 59This option is especially useful for previewing 60.Em allboxed 61tables from 62.Xr tbl 1 . 63.It Fl 2 64Causes all half-lines to be printed, effectively double spacing the output. 65Normally, a minimal space output format is used which will suppress empty 66lines. 67The program never suppresses two consecutive empty lines, however. 68The 69.Fl 2 70option is useful for sending output to the line printer when the output 71contains superscripts and subscripts which would otherwise be invisible. 72.El 73.Sh EXAMPLES 74A typical use of 75.Nm 76would be 77.Bd -literal 78tbl exum2.n \&| nroff \-ms \&| colcrt \- \&| more 79.Ed 80.Sh SEE ALSO 81.Xr col 1 , 82.Xr more 1 , 83.Xr nroff 1 , 84.Xr troff 1 , 85.Xr ul 1 86.Sh HISTORY 87The 88.Nm 89command appeared in 90.Bx 3.0 . 91.Sh BUGS 92Should fold underlines onto blanks even with the 93.Ql Fl 94option so that 95a true underline character would show. 96.Pp 97Can't back up more than 102 lines. 98.Pp 99General overstriking is lost; 100as a special case 101.Ql \&| 102overstruck with 103.Ql \- 104or underline becomes 105.Ql \&+ . 106.Pp 107Lines are trimmed to 132 characters. 108.Pp 109Some provision should be made for processing superscripts and subscripts 110in documents which are already double-spaced. 111