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127 lines
3.9 KiB
Groff
127 lines
3.9 KiB
Groff
.\" $OpenBSD: src/usr.bin/col/col.1,v 1.11 2010/10/29 07:58:04 jmc Exp $
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.\" $NetBSD: col.1,v 1.4 1995/03/26 05:25:52 glass Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Michael Rendell.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)col.1 8.1 (Berkeley) 6/29/93
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.\"
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.Dd $Mdocdate: May 31 2007 $
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.Dt COL 1
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.Os
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.Sh NAME
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.Nm col
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.Nd filter reverse line feeds and backspaces from input
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.Sh SYNOPSIS
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.Nm col
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.Op Fl bfhx
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.Op Fl l Ar num
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.Sh DESCRIPTION
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.Nm
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filters out reverse (and half-reverse) line feeds so that the output is
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in the correct order with only forward and half-forward line
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feeds, and replaces whitespace characters with tabs where possible.
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.Pp
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.Nm
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reads from the standard input and writes to the standard output.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl b
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Do not output any backspaces, printing only the last character
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written to each column position.
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This can be useful in processing the output of
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.Xr mandoc 1 .
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.It Fl f
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Forward half-line feeds are permitted
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.Pf ( Ns Dq fine
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mode).
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Normally characters printed on a half-line boundary are printed
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on the following line.
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.It Fl h
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Compress spaces into tabs.
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This is the default behavior.
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.It Fl l Ar num
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Buffer at least
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.Ar num
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lines in memory.
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By default, 128 lines are buffered.
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.It Fl x
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Output multiple spaces instead of tabs.
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.El
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.Pp
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The control sequences for carriage motion that
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.Nm
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understands and their decimal values are listed in the following
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table:
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.Pp
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.Bl -tag -width "carriage return" -compact
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.It ESC\-7
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Reverse line feed (escape then 7).
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.It ESC\-10
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Half reverse line feed (escape then 10).
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.It ESC\-11
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Half forward line feed (escape then 11).
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.It backspace
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Moves back one column (8); ignored in the first column.
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.It carriage return
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(13)
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.It newline
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Forward line feed (10); also does carriage return.
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.It shift in
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Shift to normal character set (15).
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.It shift out
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Shift to alternate character set (14).
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.It space
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Moves forward one column (32).
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.It tab
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Moves forward to next tab stop (9).
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.It vertical tab
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Reverse line feed (11).
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.El
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.Pp
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All unrecognized control characters and escape sequences are
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discarded.
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.Pp
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.Nm
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keeps track of the character set as characters are read and makes
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sure the character set is correct when they are output.
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.Pp
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If the input attempts to back up to the last flushed line,
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.Nm
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will display a warning message.
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.Sh SEE ALSO
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.Xr expand 1
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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