fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width
option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input.
Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with
nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined
to be a mail header, the first line of which must begin with "From".
Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used).
fmt can also be used as an in-line text filter for vi(1). The vi command:
!}fmt
reformats the text between the cursor location and the end of the paragraph.
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