fmt —
simple text formatter
  
    | fmt | [ -Cr] [goal
      [maximum]] [name ...] | 
  
    | fmt | [ -Cr] [-ggoal] [-mmaximum] [-wmaximum] [name ...] | 
fmt is a simple text formatter which reads the
  concatenation of input files (or standard input if none are given) and
  produces on standard output a version of its input with lines as close to the
  goal length as possible without exceeding the
  maximum. The goal length defaults
  to 65 and the maximum to 75. The spacing at the
  beginning of the input lines is preserved in the output, as are blank lines
  and interword spacing. In non raw mode, lines that look like mail headers or
  begin with a period are not formatted.
  - -C
- instructs fmtto center the text.
- -ggoal
- New way to set the goal length.
- -mmaximum
- New way to set the maximum length.
- -wmaximum
- New way to set the maximum length.
- -r
- Raw mode; formats all lines and does not make exceptions for lines that
      start with a period or look like mail headers.
fmt is meant to format mail messages prior
    to sending, but may also be useful for other simple tasks. For instance,
    within visual mode of the ex(1)
    editor (e.g., vi(1)) the
  command
!}fmt
will reformat a paragraph, evening the lines.
The fmt command appeared in
  3BSD.
The program was designed to be simple and fast - for more complex operations,
  the standard text processors are likely to be more appropriate.