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BSD 2.11 - man page for colcrt (bsd section 1)

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COLCRT(1)										COLCRT(1)

       colcrt - filter nroff output for CRT previewing

       colcrt [ - ] [ -2 ] [ file ...  ]

       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 in between the normal output

       The optional - suppresses all underlining.  It is especially useful  for  previewing  all-
       boxed 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 will suppress empty lines.  The pro-
       gram  never  suppresses two consecutive empty lines, however.  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

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

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

       Should fold underlines onto blanks even with the `-' option so that a true underline char-
       acter would show; if we did this, however, colcrt wouldn't get  rid  of	cu'd  underlining

       Can't 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.

3rd Berkeley Distribution		   May 7, 1986					COLCRT(1)
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