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Text File  |  1992-10-18  |  100 b   |  4 lines
  1. perl -pi.bak -e 'tr/A-Z/a-z/' text1 text2
  2.  
  3. perl -pi.bak -e 'y/a-zA-Z/n-za-mN-ZA-M/' rec.humor.21450
  4.