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Editing: fold.1
.\" Copyright (c) 1980, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)fold.1 8.1 (Berkeley) 6/6/93 .\" $FreeBSD$ .\" .Dd October 29, 2020 .Dt FOLD 1 .Os .Sh NAME .Nm fold .Nd "fold long lines for finite width output device" .Sh SYNOPSIS .Nm .Op Fl bs .Op Fl w Ar width .Op Ar .Sh DESCRIPTION The .Nm utility is a filter which folds the contents of the specified files, or the standard input if no files are specified, breaking the lines to have a maximum of 80 columns. .Pp The options are as follows: .Bl -tag -width indent .It Fl b Count .Ar width in bytes rather than column positions. .It Fl s Fold line after the last blank character within the first .Ar width column positions (or bytes). .It Fl w Ar width Specify a line width to use instead of the default 80 columns. The .Ar width value should be a multiple of 8 if tabs are present, or the tabs should be expanded using .Xr expand 1 before using .Nm . .El .Sh ENVIRONMENT The .Ev LANG , LC_ALL and .Ev LC_CTYPE environment variables affect the execution of .Nm as described in .Xr environ 7 . .Sh EXAMPLES Fold text in standard input with a width of 20 columns: .Bd -literal -offset indent $ echo "I am smart enough to know that I am dumb" | fold -w 15 I am smart enou gh to know that I am dumb .Ed .Pp Same as above but breaking lines after the last blank character: .Bd -literal -offset indent $ echo "I am smart enough to know that I am dumb" | fold -s -w 15 I am smart enough to know that I am dumb .Ed .Sh SEE ALSO .Xr expand 1 , .Xr fmt 1 .Sh STANDARDS The .Nm utility conforms to .St -p1003.1-2001 . .Sh HISTORY The .Nm utility first appeared in .Bx 1 . It was rewritten for .Bx 4.3 Reno to improve speed and modernize style. The .Fl b and .Fl s options were added to .Nx 1.0 for .St -p1003.2 compliance. .Sh AUTHORS .An -nosplit .An Bill Joy wrote the original version of .Nm on June 28, 1977. .An Kevin Ruddy rewrote the command in 1990, and .An J. T. Conklin added the missing options in 1993. .Sh BUGS If underlining (see .Xr ul 1 ) is present it may be messed up by folding.
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