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The 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 dashing `-') are placed on new lines in between the normal output lines.
The following options are available:
The LANG , LC_ALL and LC_CTYPE environment variables affect the execution of as described in environ(7).
A typical use of would be
tbl exum2.n | nroff -ms | colcrt - | more
col(1), more(1), nroff(1), troff(1), ul(1)
The command appeared in BSD 3.0
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.