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Manual Reference Pages  - COLCRT (1)

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colcrt - filter nroff output for CRT previewing

CONTENTS

Synopsis
Description
Examples
See Also
Bugs
History

colcrt [] [-2] []

Colcrt provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstriking is destructive. Half-line characters and underlining (changed to dashing ‘-’) are placed on new lines in between the normal output lines.

Available options:

	Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1).
-2	Causes all half-lines to be printed, effectively double spacing the output. Normally, a minimal space output format is used which will suppress empty lines. The program never suppresses two consecutive empty lines, however. The -2 option is useful for sending output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible.

A typical use of colcrt would be

tbl exum2.n | nroff -ms | colcrt - | more

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

Should fold underlines onto blanks even with the ‘’ option so that a true underline character would show.

Can’t back up more than 102 lines.

General overstriking is lost; as a special case ‘|’ overstruck with ‘-’ or underline becomes ‘+’.

Lines are trimmed to 132 characters.

Some provision should be made for processing superscripts and subscripts in documents which are already double-spaced.

The colcrt command appeared in BSD 3.0 .

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