
COLCRT(1)		    UNIX Reference Manual		   COLCRT(1)

NNAAMMEE
     ccoollccrrtt - filter nroff output for CRT previewing

SSYYNNOOPPSSIISS
     ccoollccrrtt [--] [--22] [_f_i_l_e _._._.]

DDEESSCCRRIIPPTTIIOONN
     CCoollccrrtt provides virtual half-line and reverse line feed sequences for
     terminals without such capability, and on which overstriking is destruc-
     tive.  Half-line characters and underlining (changed to dashing `-') are
     placed on new lines in between the normal output lines.

     Available options:

     --	Suppress all underlining.	It is especially useful for previewing
	     _a_l_l_b_o_x_e_d tables from tbl(1).

     --22	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 --22 option is useful
	     for sending output to the line printer when the output contains
	     superscripts and subscripts which would otherwise be invisible.

EEXXAAMMPPLLEESS
     A typical use of ccoollccrrtt would be

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

SSEEEE AALLSSOO
     nroff(1),	troff(1),  col(1),  more(1),  ul(1)

BBUUGGSS
     Should fold underlines onto blanks even with the `--' option so that a
     true underline character would show; if we did this, however, ccoollccrrtt
     wouldn't get rid of _c_u'd underlining completely.

     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.

HHIISSTTOORRYY
     The ccoollccrrtt command appeared in 3.0BSD.

3rd Berkeley Distribution	March 14, 1991				1
