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User Commands col(1)
NAME
col - reverse line-feeds filter
SYNOPSIS
col [-bfpx]
DESCRIPTION
The col utility reads from the standard input and writes to
the standard output. It performs the line overlays implied
by reverse line-feeds, and by forward and reverse half-
line-feeds. Unless -x is used, all blank characters in the
input will be converted to tab characters wherever possible.
col is particularly useful for filtering multi-column output
made with the .rt command of nroff(1) and output resulting
from use of the tbl(1) preprocessor.
The ASCII control characters SO and SI are assumed by col to
start and end text in an alternative character set. The
character set to which each input character belongs is
remembered, and on output SI and SO characters are generated
as appropriate to ensure that each character is written in
the correct character set.
On input, the only control characters accepted are space,
backspace, tab, carriage-return and newline characters, SI,
SO, VT, reverse line-feed, forward half-line-feed and
reverse half-line-feed. The VT character is an alternative
form of full reverse line-feed, included for compatibility
with some earlier programs of this type. The only other
characters to be copied to the output are those that are
printable.
The ASCII codes for the control functions and line-motion
sequences mentioned above are as given in the table below.
ESC stands for the ASCII escape character, with the octal
code 033; ESC- means a sequence of two characters, ESC fol-
lowed by the character x.
reverse line-feed ESC-7
reverse half-line-feed ESC-8
forward half-line-feed ESC-9
vertical-tab (VT) 013
start-of-text (SO) 016
end-of-text (SI) 017
OPTIONS
-b Assume that the output device in use is not capable
of backspacing. In this case, if two or more char-
acters are to appear in the same place, only the
last one read will be output.
SunOS 5.10 Last change: 1 Feb 1995 1
User Commands col(1)
-f Although col accepts half-line motions in its
input, it normally does not emit them on output.
Instead, text that would appear between lines is
moved to the next lower full-line boundary. This
treatment can be suppressed by the -f (fine)
option; in this case, the output from col may con-
tain forward half-line-feeds (ESC-9), but will
still never contain either kind of reverse line
motion.
-p Normally, col will ignore any escape sequences
unknown to it that are found in its input; the -p
option may be used to cause col to output these
sequences as regular characters, subject to over-
printing from reverse line motions. The use of this
option is highly discouraged unless the user is
fully aware of the textual position of the escape
sequences.
-x Prevent col from converting blank characters to tab
characters on output wherever possible. Tab stops
are considered to be at each column position n such
that n modulo 8 equals 1.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of col: LC_CTYPE,
LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following error values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 1 Feb 1995 2
User Commands col(1)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWesu |
|_____________________________|_____________________________|
| CSI | enabled |
|_____________________________|_____________________________|
SEE ALSO
nroff(1), tbl(1), ascii(5), attributes(5), environ(5)
NOTES
The input format accepted by col matches the output produced
by nroff with either the -T37 or -Tlp options. Use -T37 (and
the -f option of col) if the ultimate disposition of the
output of col will be a device that can interpret half-line
motions, and -Tlp otherwise.
col cannot back up more than 128 lines or handle more than
800 characters per line.
Local vertical motions that would result in backing up over
the first line of the document are ignored. As a result, the
first line must not have any superscripts.
SunOS 5.10 Last change: 1 Feb 1995 3
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This page was generated on Wed Sep 12 11:24:31 GMT 2007
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