fmt - simple optimal text formatter
fmt [-DIGITS] [OPTION]... [FILE]...
Reformat each paragraph in the FILE(s), writing to standard output. If no FILE or if FILE is ‘-’, read standard input.
Mandatory arguments to long options are mandatory for short options too.
With no FILE, or when FILE is -, read standard input.
Written by Ross Paterson.
Report bugs to <bug-coreutils@gnu.org>.
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
The full documentation for fmt is maintained as a Texinfo manual. If the info and fmt programs are properly installed at your site, the command
info fmt
should give you access to the complete manual.