1COLCRT(1)                 BSD General Commands Manual                COLCRT(1)
2

NAME

4     colcrt — filter nroff output for CRT previewing
5

SYNOPSIS

7     colcrt [-] [-2] [file ...]
8

DESCRIPTION

10     Colcrt provides virtual half-line and reverse line feed sequences for
11     terminals without such capability, and on which overstriking is destruc‐
12     tive.  Half-line characters and underlining (changed to dashing `-') are
13     placed on new lines in between the normal output lines.
14
15     Available options:
16
17     -       Suppress all underlining.  This option is especially useful for
18             previewing allboxed tables from tbl(1).
19
20     -2      Causes all half-lines to be printed, effectively double spacing
21             the output.  Normally, a minimal space output format is used
22             which will suppress empty lines.  The program never suppresses
23             two consecutive empty lines, however.  The -2 option is useful
24             for sending output to the line printer when the output contains
25             superscripts and subscripts which would otherwise be invisible.
26

EXAMPLES

28     A typical use of colcrt would be
29
30     tbl exum2.n | nroff -ms | colcrt - | more
31

SEE ALSO

33     nroff(1), troff(1), col(1), more(1), ul(1)
34

BUGS

36     Should fold underlines onto blanks even with the ‘-’ option so that a
37     true underline character would show.
38
39     Can't back up more than 102 lines.
40
41     General overstriking is lost; as a special case ‘|’ overstruck with ‘-’
42     or underline becomes ‘+’.
43
44     Lines are trimmed to 132 characters.
45
46     Some provision should be made for processing superscripts and subscripts
47     in documents which are already double-spaced.
48

HISTORY

50     The colcrt command appeared in 3.0BSD.
51

AVAILABILITY

53     The colcrt command is part of the util-linux-ng package and is available
54     from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
55
563rd Berkeley Distribution        June 30, 1993       3rd Berkeley Distribution
Impressum