1COLCRT(1)                        User Commands                       COLCRT(1)
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NAME

6       colcrt - filter nroff output for CRT previewing
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SYNOPSIS

9       colcrt [options] [file ...]
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DESCRIPTION

12       colcrt provides virtual half-line and reverse line feed sequences for
13       terminals without such capability, and on which overstriking is
14       destructive. Half-line characters and underlining (changed to dashing
15       `-') are placed on new lines in between the normal output lines.
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OPTIONS

18       -, --no-underlining
19           Suppress all underlining. This option is especially useful for
20           previewing allboxed tables from tbl(1).
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22       -2, --half-lines
23           Causes all half-lines to be printed, effectively double spacing the
24           output. Normally, a minimal space output format is used which will
25           suppress empty lines. The program never suppresses two consecutive
26           empty lines, however. The -2 option is useful for sending output to
27           the line printer when the output contains superscripts and
28           subscripts which would otherwise be partially invisible.
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30       -h, --help
31           Display help text and exit.
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33       -V, --version
34           Print version and exit.
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HISTORY

37       The colcrt command appeared in 3.0BSD.
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BUGS

40       Should fold underlines onto blanks even with the - option so that a
41       true underline character would show.
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43       Can’t back up more than 102 lines.
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45       General overstriking is lost; as a special case '|' overstruck with '-'
46       or underline becomes '+'.
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48       Lines are trimmed to 132 characters.
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50       Some provision should be made for processing superscripts and
51       subscripts in documents which are already double-spaced.
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EXAMPLES

54       A typical use of colcrt would be:
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56          tbl exum2.n | nroff -ms | colcrt - | more
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SEE ALSO

59       col(1), more(1), nroff(1), troff(1), ul(1)
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REPORTING BUGS

62       For bug reports, use the issue tracker at
63       https://github.com/util-linux/util-linux/issues.
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AVAILABILITY

66       The colcrt command is part of the util-linux package which can be
67       downloaded from Linux Kernel Archive
68       <https://www.kernel.org/pub/linux/utils/util-linux/>.
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72util-linux 2.38.1                 2022-05-11                         COLCRT(1)
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