col(1)								   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 followed 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 characters are to appear in the
	      same place, only the last one read will be output.

       -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 contain 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 overprinting 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 attributes:

       +-----------------------------+-----------------------------+
       |      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 5.11							    1 Feb 1995								    col(1)