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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 overstriking is destructive. Half-line characters and underlining (changed to dash- ing ‘−’) 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. ENVIRONMENT The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colcrt as described in environ(7). EXIT STATUS The colcrt utility exits 0 on success, and >0 if an error occurs. 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) HISTORY The colcrt command appeared in 3.0BSD. BUGS Should fold underlines onto blanks even with the ‘− ’ option so that a true underline character would show. Cannot 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. Characters that take up more than one column position may not be underlined correctly. BSD July 31, 2004 1
