colcrt - Unix, Linux Command
NAMEcolcrt - filter nroff output for CRT previewing
SYNOPSIScolcrt  [-2] 
DESCRIPTIONColcrt 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.
|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.|
EXAMPLESA typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
BUGSShould fold underlines onto blanks even with the option so that a true underline character would show.
Cant 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.
HISTORYThe colcrt command appeared in BSD 3.0 .