1.\" $OpenBSD: fold.1,v 1.16 2011/12/28 22:27:18 schwarze Exp $ 2.\" $NetBSD: fold.1,v 1.5 1995/09/01 01:42:42 jtc Exp $ 3.\" 4.\" Copyright (c) 1980, 1993 5.\" The Regents of the University of California. All rights reserved. 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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)fold.1 8.1 (Berkeley) 6/6/93 32.\" 33.Dd $Mdocdate: December 28 2011 $ 34.Dt FOLD 1 35.Os 36.Sh NAME 37.Nm fold 38.Nd fold long lines for finite width output device 39.Sh SYNOPSIS 40.Nm fold 41.Op Fl bs 42.Op Fl w Ar width 43.Op Ar 44.Sh DESCRIPTION 45.Nm 46is a filter which folds the contents of the specified files, 47or the standard input if no files are specified, 48breaking the lines to have a maximum of 80 characters. 49.Pp 50The options are as follows: 51.Bl -tag -width Ds 52.It Fl b 53Count 54.Ar width 55in bytes rather than column positions. 56.It Fl s 57Fold line after the last blank character within the first 58.Ar width 59column positions (or bytes). 60.It Fl w Ar width 61Specifies a line width to use instead of the default 80 characters. 62.El 63.Sh EXIT STATUS 64.Ex -std fold 65.Sh SEE ALSO 66.Xr expand 1 67.Sh STANDARDS 68The 69.Nm 70utility is compliant with the 71.St -p1003.1-2008 72specification. 73.Sh HISTORY 74The 75.Nm 76utility first appeared in 77.Bx 1 . 78It was rewritten for 79.Bx 4.3 Reno 80to improve speed and modernize style. 81The 82.Fl b 83and 84.Fl s 85options were added to 86.Nx 1.0 87for 88.St -p1003.2 89compliance. 90.Sh AUTHORS 91.An -nosplit 92.An Bill Joy 93wrote the original version of 94.Nm 95on June 28, 1977. 96.An Kevin Ruddy 97rewrote the command in 1990, and 98.An J. T. Conklin 99added the missing options in 1993. 100.Sh BUGS 101If underlining (see 102.Xr ul 1 ) 103is present it may be messed up by folding. 104.Pp 105.Ar width 106should be a multiple of 8 if tabs are present, or the tabs should 107be expanded using 108.Xr expand 1 109before using 110.Nm fold . 111