1COLCRT(1)                   General Commands Manual                  COLCRT(1)
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NAME

6       colcrt - filter nroff output for CRT previewing
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SYNOPSIS

9       colcrt [ - ] [ -2 ] [ file ...  ]
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DESCRIPTION

12       Colcrt  provides  virtual half-line and reverse line feed sequences for
13       terminals  without  such  capability,  and  on  which  overstriking  is
14       destructive.   Half-line characters and underlining (changed to dashing
15       `-') are placed on new lines in between the normal output lines.
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17       The optional - suppresses all underlining.  It is especially useful for
18       previewing allboxed tables from tbl(1).
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20       The  option  -2 causes all half-lines to be printed, effectively double
21       spacing the output.  Normally, a minimal space output  format  is  used
22       which will suppress empty lines.  The program never suppresses two con‐
23       secutive empty lines, however.  The -2 option  is  useful  for  sending
24       output  to  the  line printer when the output contains superscripts and
25       subscripts which would otherwise be invisible.
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27       A typical use of colcrt would be
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29            tbl exum2.n | nroff -ms | colcrt - | more
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SEE ALSO

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

35       Should fold underlines onto blanks even with the `-' option so  that  a
36       true  underline  character  would show; if we did this, however, colcrt
37       wouldn't get rid of cu'd underlining completely.
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39       Can't back up more than 102 lines.
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41       General overstriking is lost; as a special case `|' overstruck with `-'
42       or underline becomes `+'.
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44       Lines are trimmed to 132 characters.
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46       Some  provision  should  be  made  for processing superscripts and sub‐
47       scripts in documents which are already double-spaced.
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513rd Berkeley Distribution         May 7, 1986                        COLCRT(1)
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