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  1. or download this
    #!/usr/bin/perl -w
    
    use strict;
    ...
        print localtime() . "\n";
        sleep 1;
    }
    
  2. or download this
    #!/usr/bin/perl -w
    
    use strict;
    ...
        $time_to_die = 1;
        kill ('HUP', -$$);
    }
    
  3. or download this
    $| = 1;
    $^F = 10000;
    STDOUT->autoflush(1);