fmt - adjust line-length for paragraphs of text
fmt [-width] [files]...
fmt is a simple text formatter. It inserts or deletes
newlines, as necessary, to make all lines in a paragraph
be approximately the same width. It preserves indentation
and word spacing.
The default line width is 72 characters. You can override
this with the -width flag. If you don't name any files on
the command line, then fmt will read from stdin.
It is typically used from within vi to adjust the line
breaks in a single paragraph. To do this, move the cursor
to the top of the paragraph, type "!}fmt", and hit