## NAME

## SYNOPSIS

## DESCRIPTION

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:

Suppress all underlining. This option is especially useful for previewing

tables from

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

option is useful for sending output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible.

## ENVIRONMENT

The

and

environment variables affect the execution of

as described in

## EXIT STATUS

## EXAMPLES

A typical use of

would be

tbl exum2.n | nroff -ms | colcrt - | more

## SEE ALSO

## HISTORY

The

command appeared in

## 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.