NAME

colcrt − filter nroff output for CRT previewing

SYNOPSIS

colcrt [ − ] [ −2 ] [ file ...  ]

DESCRIPTION

Colcrt 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 inbetween the normal output lines. 

The optional − suppresses all underlining and is especially useful for previewing allboxed tables from tbl(1).

The option −2 causes all half-lines to be printed, effectively double-spacing the output.  Normally, a minimal space output format is used which suppresses empty lines.  However, the program never suppresses two consecutive empty lines.  The −2 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 colcrt would be as follows:

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

SEE ALSO

nroff/troff(1), col(1), more(1), ul(1)

AUTHOR

William Joy

BUGS

The filter should fold underlines onto blanks, even with the ‘−’ option, so that a true underline character shows; if this were possible, however, colcrt would not eliminate cu’d underlining completely. 

Can not back up more than 102 lines. 

General overstriking is lost; for example ‘|’ 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. 

3rd Berkeley Distribution  —  @(#)colcrt.11.1%Q%%Y%