1.\" $NetBSD: col.1,v 1.8 2001/12/01 16:43:10 wiz Exp $ 2.\" 3.\" Copyright (c) 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Michael Rendell. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)col.1 8.1 (Berkeley) 6/29/93 38.\" 39.Dd February 22, 1999 40.Dt COL 1 41.Os 42.Sh NAME 43.Nm col 44.Nd filter reverse line feeds from input 45.Sh SYNOPSIS 46.Nm 47.Op Fl bfpx 48.Op Fl l Ar num 49.Sh DESCRIPTION 50.Nm 51filters out reverse (and half reverse) line feeds so that the output is 52in the correct order with only forward and half forward line 53feeds, and replaces white-space characters with tabs where possible. 54This can be useful in processing the output of 55.Xr nroff 1 56and 57.Xr tbl 1 . 58.Pp 59.Nm 60reads from the standard input and writes to the standard output. 61.Pp 62The options are as follows: 63.Bl -tag -width "-l num " 64.It Fl b 65Do not output any backspaces, printing only the last character 66written to each column position. 67.It Fl f 68Forward half line feeds are permitted (``fine'' mode). 69Normally characters printed on a half line boundary are printed 70on the following line. 71.It Fl p 72Force unknown control sequences to be passed through unchanged. 73Normally, 74.Nm 75will filter out any control sequences from the input other than those 76recognized and interpreted by itself, which are listed below. 77.It Fl x 78Output multiple spaces instead of tabs. 79.It Fl l Ar num 80Buffer at least 81.Ar num 82lines in memory. 83By default, 128 lines are buffered. 84.El 85.Pp 86The control sequences for carriage motion that 87.Nm 88understands and their decimal values are listed in the following 89table: 90.Pp 91.Bl -tag -width "carriage return" -compact 92.It ESC\-7 93reverse line feed (escape then 7) 94.It ESC\-8 95half reverse line feed (escape then 8) 96.It ESC\-9 97half forward line feed (escape then 9) 98.It backspace 99moves back one column (8); ignored in the first column 100.It carriage return 101(13) 102.It newline 103forward line feed (10); also does carriage return 104.It shift in 105shift to normal character set (15) 106.It shift out 107shift to alternative character set (14) 108.It space 109moves forward one column (32) 110.It tab 111moves forward to next tab stop (9) 112.It vertical tab 113reverse line feed (11) 114.El 115.Pp 116All unrecognized control characters and escape sequences are 117discarded. 118.Pp 119.Nm 120keeps track of the character set as characters are read and makes 121sure the character set is correct when they are output. 122.Pp 123If the input attempts to back up to the last flushed line, 124.Nm 125will display a warning message. 126.Sh SEE ALSO 127.Xr expand 1 , 128.Xr nroff 1 , 129.Xr tbl 1 130.Sh STANDARDS 131The 132.Nm 133utility conforms to 134.St -xpg4.2 . 135The 136.Fl l 137option is an extension to the standard. 138.Sh HISTORY 139A 140.Nm 141command appeared in 142.At v6 . 143