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).

FLAGS

  -   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.  colcrt changes underline characters to dashes and places
  them and half-line characters on new lines in between the normal output
  lines.

EXAMPLES

  The following command line illustrates a typical use of colcrt:

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


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.

RELATED INFORMATION

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