Format text with long lines to text with fixed width

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 $ fmt -s -w80 file.txt

Jan. 22, 2012, 10:08 a.m. — Janos

Explanation

  • It will break lines longer than 80 characters at appropriate white spaces to make them less than 80 characters long.
  • The -s flag will collapse multiple consecutive white spaces into one, or at the end of a sentence a double space.