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Text File  |  1992-10-18  |  155 b   |  6 lines

  1. open(FOO, "|tr '[a-z]' '[A-Z]'");
  2. open(FOO, "|-") || exec 'tr', '[a-z]', '[A-Z]';
  3.  
  4. open(FOO, "cat -n file|");
  5. open(FOO, "-|") || exec 'cat', '-n', 'file';
  6.