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---- __NAME__ colcrt - filter nroff output for CRT previewing __SYNOPSIS__ colcrt [[-] [[-2] [[file ...] __DESCRIPTION__ 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. The following options are available: - Suppress all underlining. This option is especiallyuseful for previewing ''allboxed'' tables from tbl (1). -2 Cause all half-lines to be printed, effectively dou- ble 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 oth- erwise 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. 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. __HISTORY__ The colcrt command appeared in 3.0 BSD . BSD June 30, 1993 1 ----
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colcrt(1)
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