Format text with long lines to text with fixed width 

fmt -s -w80 file.txt

January 22, 2012 — bashoneliners

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.
text-formatting
fmt