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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.
Available options:
  • Fl Suppress all underlining. This option is especially useful for previewing 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 option is useful for sending output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible.


A typical use of would be
tbl exum2.n | nroff -ms | colcrt - | more


nroff(1) troff(1) col(1) more(1) ul(1)


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.


The command appeared in x 3.0 .


The colcrt command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.