COLCRT(1) User Commands COLCRT(1) NAME colcrt - filter nroff output for CRT previewing SYNOPSIS colcrt [options] [file ...] DESCRIPTION colcrt provides virtual half-line and reverse line feed sequences for ter- minals 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 -, --no-underlining Suppress all underlining. This option is especially useful for preview- ing allboxed tables from tbl(1). -2, --half-lines Causes all half-lines to be printed, effectively double spacing the output. Normally, a minimal space output format is used which will sup- press 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 partially invisible. -h, --help Display help text and exit. -V, --version Display version and exit. 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. 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. 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) REPORTING BUGS For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>. AVAILABILITY The colcrt command is part of the util-linux package which can be down- loaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>. util-linux 2.41.2 2025-09-22 COLCRT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | HISTORY | BUGS | EXAMPLES | SEE ALSO | REPORTING BUGS | AVAILABILITY
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