[-] [-2] [file …]
This command is a hack to display underlines, tables, and other half-line intensive output on terminals that can't display underlines. It works by double-spacing the output and putting dashes on the empty line beneath the word that is to be underlined.
Example: Colcrt might be used to display the tbl.n table file as follows:
tbl tbl.n | nroff -ms | colcrt - | less
|-||Do not underline. Typically used in displaying tables.|
|-2||Print all half-lines whether they're empty or not. (Leads to a uniform appearance, but eats up space.)|
[ -rvCNR ] [ -dcc ] [ -Tname ] [ -Mdir ] [ -fF ] [ -sn] [ -pn ] [ -mn ] [ files… ]
eqn is used in conjunction with troff to compile equation descriptions into troff format.