COLCRT(1) BSD General Commands Manual COLCRT(1) NAME colcrt - filter nroff output for CRT previewing SYNOPSIS colcrt [-] [-2] [file ...] DESCRIPTION The colcrt utility provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstrik ing is destructive. Half-line characters and underlining (changed to dashing -) are placed on new lines in between the normal output lines. The following options are available: - Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1). -2 Cause 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. EXAMPLES A typical use of colcrt would be tbl exum2.n | nroff -ms | colcrt - | more SEE ALSO col(1), more(1), nroff(1), troff(1), ul(1) BUGS Should 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. HISTORY The colcrt command appeared in 3.0BSD. BSD June 30, 1993 BSD