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28 .\" @(#)colcrt.1 8.1 (Berkeley) 6/30/93
29 .\" $FreeBSD: src/usr.bin/colcrt/colcrt.1,v 1.4.2.6 2003/02/24 23:04:38 trhodes Exp $
30 .\" $DragonFly: src/usr.bin/colcrt/colcrt.1,v 1.3 2006/02/17 19:38:58 swildner Exp $
37 .Nd filter nroff output for CRT previewing
46 utility provides virtual half-line and reverse line feed sequences
47 for terminals without such capability, and on which overstriking
49 Half-line characters and underlining (changed to dashing `\-')
50 are placed on new lines in between the normal output lines.
52 The following options are available:
53 .Bl -tag -width indent
55 Suppress all underlining.
56 This option is especially useful for previewing
61 Cause all half-lines to be printed, effectively double spacing the output.
62 Normally, a minimal space output format is used which will suppress empty
64 The program never suppresses two consecutive empty lines, however.
67 option is useful for sending output to the line printer when the output
68 contains superscripts and subscripts which would otherwise be invisible.
75 tbl exum2.n \&| nroff \-ms \&| colcrt \- \&| more
89 Should fold underlines onto blanks even with the
92 a true underline character would show.
94 Can't back up more than 102 lines.
96 General overstriking is lost;
104 Lines are trimmed to 132 characters.
106 Some provision should be made for processing superscripts and subscripts
107 in documents which are already double-spaced.