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colcrt(1)							    colcrt(1)



NAME

  colcrt - Filters text	processor output for screen previewing

SYNOPSIS

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

  The colcrt command filters output from text processors such as nroff so
  that it can be previewed on a	cathode	ray tube (CRT).

OPTIONS

  -   Suppresses underlining; this is useful for previewing boxed tables from
      tbl.

  -2  Causes all half-lines to be printed, effectively doublespacing the out-
      put.  This is useful when	printing output	with subscripts	and super-
      scripts on a line	printer, where half-lines do not normally appear.

DESCRIPTION

  The colcrt command provides virtual half-linefeed and	reverse	linefeed
  sequences for	terminals without such capability, and on which	overstriking
  is destructive. The colcrt command changes underline characters to dashes
  and places them and half-line	characters on new lines	in between the normal
  output lines.

NOTES

   1.  colcrt cannot back up more than 102 lines.

   2.  General overstriking is lost; as	a special case a | (vertical bar)
       overstruck with a - (dash) or _ (underline) becomes a + (plus sign).

   3.  Lines are trimmed to 132	bytes.

EXAMPLES

  The following	command	line illustrates a typical use of colcrt:

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

SEE ALSO

  Commands:  col(1), deroff(1),	more(1), neqn(1), nroff(1), pg(1), tbl(1),
  ul(1)