1.\" Copyright (c) 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Michael Rendell. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. 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 June 29, 1993 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 bfx 46.Op Fl l Ar num 47.Sh DESCRIPTION 48.Nm Col 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 white-space 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 Col 58reads from the standard input and writes to the standard output. 59.Pp 60The options are as follows: 61.Bl -tag -width "-l num " 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 (``fine'' mode). 67Normally characters printed on a half line boundary are printed 68on the following line. 69.It Fl x 70Output multiple spaces instead of tabs. 71.It Fl l Ar num 72Buffer at least 73.Ar num 74lines in memory. 75By default, 128 lines are buffered. 76.El 77.Pp 78The control sequences for carriage motion that 79.Nm col 80understands and their decimal values are listed in the following 81table: 82.Pp 83.Bl -tag -width "carriage return" -compact 84.It ESC\-7 85reverse line feed (escape then 7) 86.It ESC\-8 87half reverse line feed (escape then 8) 88.It ESC\-9 89half forward line feed (escape then 9) 90.It backspace 91moves back one column (8); ignored in the first column 92.It carriage return 93(13) 94.It newline 95forward line feed (10); also does carriage return 96.It shift in 97shift to normal character set (15) 98.It shift out 99shift to alternate character set (14) 100.It space 101moves forward one column (32) 102.It tab 103moves forward to next tab stop (9) 104.It vertical tab 105reverse line feed (11) 106.El 107.Pp 108All unrecognized control characters and escape sequences are 109discarded. 110.Pp 111.Nm Col 112keeps track of the character set as characters are read and makes 113sure the character set is correct when they are output. 114.Pp 115If the input attempts to back up to the last flushed line, 116.Nm col 117will display a warning message. 118.Sh SEE ALSO 119.Xr expand 1 , 120.Xr nroff 1 , 121.Xr tbl 1 122.Sh HISTORY 123A 124.Nm col 125command 126appeared in Version 6 AT&T UNIX. 127