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