colcrt Command
Purpose
Filters nroff command output for cathode ray tube (CRT) previewing.
Syntax
Description
The colcrt command filters output from the nroff command so that the output can be previewed on a CRT. The colcrt command provides virtual half-line-feed and reverse line-feed sequences for terminals without these capabilities. The colcrt command changes underline characters to dashes and places these characters and the half-line characters on new lines between the normal output lines.
Notes:
- Use this command with the 37 viewing device
- The - (minus sign) flag removes all underlining; therefore, a true underline character does not show with the - (minus sign) flag.
- It is not possible to back up more than 102 lines.
- General overstriking is lost. As a special case, the | (vertical bar) overstruck with the - (dash) or the _ (underline) characters becomes the + (plus sign).
- Lines are truncated to up to 132 characters.
Parameters
| Item | Description |
|---|---|
| File | Specifies a file processed by the nroff command for viewing on a CRT. |
Flags
| Item | Description |
|---|---|
| - | Suppresses underlining. This flag is useful for previewing boxed tables from the tbl command. |
| -2 | Causes all half-lines to be printed, effectively double-spacing the output. This is useful when printing output with subscripts and superscripts on a line printer, where half-lines normally are not displayed. |
Examples
A typical use of the colcrt command is:
tbl exum2.n | nroff -ms -T37 | colcrt - | pg