# 2.11BSD#431 - /usr/man/cat1/col.0

    COL(1)		    UNIX Programmer's Manual		   COL(1)

    NAME
         col - filter reverse line feeds

    SYNOPSIS
         col [ -bfh ]

    DESCRIPTION
         Col reads the standard input and writes the standard output.
         It performs the line overlays implied by reverse line feeds
         (ESC-7 in ASCII) and by forward and reverse half line feeds
         (ESC-9 and ESC-8).  Col is particularly useful for filtering
         multicolumn output made with the `.rt' command of nroff and
         output resulting from use of the tbl(1) preprocessor.

         Although col accepts half line motions in its input, it nor-
         mally 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 con-
         tain either kind of reverse line motion.

         If the -b option is given, col assumes that the output dev-
         ice in use is not capable of backspacing.	In this case, if
         several characters are to appear in the same place, only the
         last one read will be taken.

         The control characters SO (ASCII code 017), and SI (016) are
         assumed to start and end text in an alternate character set.
         The character set (primary or alternate) associated with
         each printing character read is remembered; on output, SO
         and SI characters are generated where necessary to maintain
         the correct treatment of each character.

         If the -h option is given, col converts white space to tabs
         to shorten printing time.

         All control characters are removed from the input except
         space, backspace, tab, return, newline, ESC (033) followed
         by one of 7, 8, 9, SI, SO, and VT (013).  This last charac-
         ter is an alternate form of full reverse line feed, for com-
         patibility with some other hardware conventions.  All other
         non-printing characters are ignored.

    SEE ALSO
         troff(1), tbl(1)

    BUGS
         Can't back up more than 128 lines.
         No more than 800 characters, including backspaces, on a
         line.

    Printed 11/26/99	  May 16, 1986				1

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