1.\" $MirOS: src/usr.bin/col/col.1,v 1.6 2008/08/02 00:57:31 tg Exp $ 2.\" $OpenBSD: col.1,v 1.8 2003/06/03 02:56:06 millert Exp $ 3.\" $NetBSD: col.1,v 1.4 1995/03/26 05:25:52 glass Exp $ 4.\" 5.\" Copyright (c) 1990, 1993 6.\" The Regents of the University of California. All rights reserved. 7.\" 8.\" This code is derived from software contributed to Berkeley by 9.\" Michael Rendell. 10.\" 11.\" Redistribution and use in source and binary forms, with or without 12.\" modification, are permitted provided that the following conditions 13.\" are met: 14.\" 1. Redistributions of source code must retain the above copyright 15.\" notice, this list of conditions and the following disclaimer. 16.\" 2. Redistributions in binary form must reproduce the above copyright 17.\" notice, this list of conditions and the following disclaimer in the 18.\" documentation and/or other materials provided with the distribution. 19.\" 3. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)col.1 8.1 (Berkeley) 6/29/93 36.\" 37.Dd $Mdocdate: August 2 2008 $ 38.Dt COL 1 39.Os 40.Sh NAME 41.Nm col 42.Nd filter reverse line feeds from input 43.Sh SYNOPSIS 44.Nm col 45.Op Fl bfhx 46.Op Fl l Ar num 47.Sh DESCRIPTION 48.Nm 49filters out reverse (and half-reverse) line feeds so that the output is 50in the correct order with only forward and half-forward line 51feeds, and replaces whitespace characters with tabs where possible. 52This can be useful in processing the output of 53.Xr nroff 1 54and 55.Xr tbl 1 . 56.Pp 57.Nm 58reads from the standard input and writes to the standard output. 59.Pp 60The options are as follows: 61.Bl -tag -width Ds 62.It Fl b 63Do not output any backspaces, printing only the last character 64written to each column position. 65.It Fl f 66Forward half-line feeds are permitted 67.Pf ( Ns Dq fine 68mode). 69Normally characters printed on a half-line boundary are printed 70on the following line. 71.It Fl h 72Compress spaces into tabs. 73This is the default behavior. 74.It Fl x 75Output multiple spaces instead of tabs. 76.It Fl l Ar num 77Buffer at least 78.Ar num 79lines in memory. 80By default, 256 lines are buffered. 81.El 82.Pp 83The control sequences for carriage motion that 84.Nm 85understands and their decimal values are listed in the following 86table: 87.Pp 88.Bl -tag -width "carriage return" -compact 89.It ESC\-7 90Reverse line feed (escape then 7). 91.It ESC\-10 92Half reverse line feed (escape then 10). 93.It ESC\-11 94Half forward line feed (escape then 11). 95.It backspace 96Moves back one column (8); ignored in the first column. 97.It carriage return 98Move back to first column (13). 99.It newline 100Forward line feed (10); also does carriage return. 101.It shift in 102Shift to normal character set (15). 103.It shift out 104Shift to alternate character set (14). 105.It space 106Moves forward one column (32). 107.It tab 108Moves forward to next tab stop (9). 109.It vertical tab 110Reverse line feed (11). 111.El 112.Pp 113All unrecognised control characters and escape sequences are 114discarded. 115.Pp 116.Nm 117keeps track of the character set as characters are read and makes 118sure the character set is correct when they are output. 119.Pp 120If the input attempts to back up to the last flushed line, 121.Nm 122will display a warning message. 123.Sh SEE ALSO 124.Xr expand 1 , 125.Xr nroff 1 , 126.Xr tbl 1 127.Sh HISTORY 128A 129.Nm 130command appeared in 131.At v6 . 132It was made locale aware in 133.Mx 10 . 134