colcrt(1)
Name
colcrt − filter nroff output for CRT previewing
Syntax
colcrt [−] [−2] [file...]
Description
The colcrt command 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.
Options
−Suppresses all underlining. It is especially useful for previewing allboxed tables from tbl(.).
−2Causes half-lines to be printed, 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.
Examples
A typical use of colcrt would be:
tbl exum2.n | nroff −ms | colcrt − | more
Restrictions
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.