07-18-2010
@OP
What the command does is, say for 3 lines to be wrapped, till the 3rd line is reached, it forms a variable x with comma separated values. I mean, everytime a line is read, the line is assigned to the variable x with a coma. When the 3rd line is reached, print the variable x.
The END is needed in case of your total file line count not being a mod of 3. In this case, the last line will be printed when the file is finished processing.
Guru.
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COLCRT(1) BSD General Commands Manual COLCRT(1)
NAME
colcrt -- filter nroff output for CRT previewing
SYNOPSIS
colcrt [-] [-2] [file ...]
DESCRIPTION
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.
Available options:
- Suppress all underlining. This option is especially useful for previewing allboxed tables from tbl(1).
-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 -2 option is useful for sending
output to the line printer when the output contains superscripts and subscripts which would otherwise be invisible.
EXAMPLES
A typical use of colcrt would be
tbl exum2.n | nroff -ms | colcrt - | more
SEE ALSO
nroff(1), troff(1), col(1), more(1), ul(1)
BUGS
Should fold underlines onto blanks even with the '-' option so that a true underline character would show.
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.
HISTORY
The colcrt command appeared in 3.0BSD.
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/.
3rd Berkeley Distribution June 30, 1993 3rd Berkeley Distribution