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    open2 (\*INP, \*OUTP, 'path_to_external_program');
    print "included";
    1;
    
  2. or download this
    require "db.pl";
    $file = $ARGV[0] #the next file to process
    print OUTP some_command_using_$file; #exec some cmds on external prog
    #more lines follow afterwards