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+.\" Copyright (c) 1990 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Michael Rendell.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)col.1	6.8 (Berkeley) 6/17/91
+.\"
+.Dd June 17, 1991
+.Dt COL 1
+.Os
+.Sh NAME
+.Nm col
+.Nd filter reverse line feeds from input
+.Sh SYNOPSIS
+.Nm col
+.Op Fl bfx
+.Op Fl l Ar num
+.Sh DESCRIPTION
+.Nm Col
+filters out reverse (and half reverse) line feeds so the output is
+in the correct order with only forward and half forward line
+feeds, and replaces white-space characters with tabs where possible.
+This can be useful in processing the output of
+.Xr nroff 1
+and
+.Xr tbl  1 .
+.Pp
+.Nm Col
+reads from standard input and writes to standard output.
+.Pp
+The options are as follows:
+.Bl -tag -width "-lnum"
+.It Fl b
+Do not output any backspaces, printing only the last character
+written to each column position.
+.It Fl f
+Forward half line feeds are permitted (``fine'' mode).
+Normally characters printed on a half line boundary are printed
+on the following line.
+.It Fl x
+Output multiple spaces instead of tabs.
+.It Fl l Ns Ar num
+Buffer at least
+.Ar num
+lines in memory.
+By default, 128 lines are buffered.
+.El
+.Pp
+The control sequences for carriage motion that
+.Nm col
+understands and their decimal values are listed in the following
+table:
+.Pp
+.Bl -tag -width "carriage return" -compact
+.It ESC\-7
+reverse line feed (escape then 7)
+.It ESC\-8
+half reverse line feed (escape then 8)
+.It ESC\-9
+half forward line feed (escape then 9)
+.It backspace
+moves back one column (8); ignored in the first column
+.It carriage return
+(13)
+.It newline
+forward line feed (10); also does carriage return
+.It shift in
+shift to normal character set (15)
+.It shift out
+shift to alternate character set (14)
+.It space
+moves forward one column (32)
+.It tab
+moves forward to next tab stop (9)
+.It vertical tab
+reverse line feed (11)
+.El
+.Pp
+All unrecognized control characters and escape sequences are
+discarded.
+.Pp
+.Nm Col
+keeps track of the character set as characters are read and makes
+sure the character set is correct when they are output.
+.Pp
+If the input attempts to back up to the last flushed line,
+.Nm col
+will display a warning message.
+.Sh SEE ALSO
+.Xr expand 1 ,
+.Xr nroff 1 ,
+.Xr tbl 1
+.Sh HISTORY
+A
+.Nm col
+command
+appeared in Version 6 AT&T UNIX.