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| .\" The Regents of the University of California. All rights reserved. |
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| .\" @(#)colcrt.1 8.1 (Berkeley) 6/30/93 |
| .\" |
| .Dd June 30, 1993 |
| .Dt COLCRT 1 |
| .Os BSD 3 |
| .Sh NAME |
| .Nm colcrt |
| .Nd filter nroff output for CRT previewing |
| .Sh SYNOPSIS |
| .Nm colcrt |
| .Op Fl |
| .Op Fl \&2 |
| .Op Ar |
| .Sh DESCRIPTION |
| .Nm 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 lines. |
| .Pp |
| Available options: |
| .Bl -tag -width Ds |
| .It Fl |
| Suppress all underlining. |
| This option is especially useful for previewing |
| .Em allboxed |
| tables from |
| .Xr tbl 1 . |
| .It Fl 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 program never suppresses two consecutive empty lines, however. |
| The |
| .Fl 2 |
| option is useful for sending output to the line printer when the output |
| contains superscripts and subscripts which would otherwise be invisible. |
| .El |
| .Sh EXAMPLES |
| A typical use of |
| .Nm colcrt |
| would be |
| .Bd -literal |
| tbl exum2.n \&| nroff \-ms \&| colcrt \- \&| more |
| .Ed |
| .Sh SEE ALSO |
| .Xr nroff 1 , |
| .Xr troff 1 , |
| .Xr col 1 , |
| .Xr more 1 , |
| .Xr ul 1 |
| .Sh BUGS |
| Should fold underlines onto blanks even with the |
| .Ql Fl |
| option so that |
| a true underline character would show. |
| .Pp |
| Can't back up more than 102 lines. |
| .Pp |
| General overstriking is lost; |
| as a special case |
| .Ql \&| |
| overstruck with |
| .Ql \- |
| or underline becomes |
| .Ql \&+ . |
| .Pp |
| Lines are trimmed to 132 characters. |
| .Pp |
| Some provision should be made for processing superscripts and subscripts |
| in documents which are already double-spaced. |
| .Sh HISTORY |
| The |
| .Nm |
| command appeared in |
| .Bx 3.0 . |
| .Sh AVAILABILITY |
| The colcrt command is part of the util-linux-ng package and is available from |
| ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. |