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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: Suppress all underlining.
This option is especially useful for previewing tables from 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
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
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