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@(#)colcrt.1 8.1 (Berkeley) 6/30/93
.Dd June 30, 1993 .Dt COLCRT 1 .Os .Sh NAME .Nm colcrt .Nd filter nroff output for CRT previewing .Sh SYNOPSIS .Nm .Op Fl .Op Fl 2 .Op Ar .Sh DESCRIPTION .Nm 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.
p Available options: l -tag -width Ds t Fl Suppress all underlining. This option is especially useful for previewing .Em allboxed tables from .Xr tbl 1 . t Fl 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 .Fl 2 option is useful for sending output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible. .El .Sh EXAMPLES A typical use of .Nm would be d -literal tbl exum2.n | nroff -ms | colcrt - | more .Ed .Sh SEE ALSO .Xr col 1 , .Xr more 1 , .Xr nroff 1 , .Xr troff 1 , .Xr ul 1 .Sh HISTORY The .Nm command appeared in x 1 . .Sh BUGS Should fold underlines onto blanks even with the .Ql Fl option so that a true underline character would show.
p Can't back up more than 102 lines.
p General overstriking is lost; as a special case .Ql | overstruck with .Ql - or underline becomes .Ql + .
p Lines are trimmed to 132 characters.
p Some provision should be made for processing superscripts and subscripts in documents which are already double-spaced.