fmt --version (return code: 0)
fmt (GNU coreutils) 8.25
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Ross Paterson.
fmt --help (return code: 0)
Usage: fmt [-WIDTH] [OPTION]... [FILE]...
Reformat each paragraph in the FILE(s), writing to standard output.
The option -WIDTH is an abbreviated form of --width=DIGITS.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
-c, --crown-margin preserve indentation of first two lines
-p, --prefix=STRING reformat only lines beginning with STRING,
reattaching the prefix to reformatted lines
-s, --split-only split long lines, but do not refill
-t, --tagged-paragraph indentation of first line different from second
-u, --uniform-spacing one space between words, two after sentences
-w, --width=WIDTH maximum line width (default of 75 columns)
-g, --goal=WIDTH goal width (default of 93% of width)
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Full documentation at: <http://www.gnu.org/software/coreutils/fmt>
or available locally via: info '(coreutils) fmt invocation'