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    Use of uninitialized value in print at xxx line yyy, <STDIN> line 2 (#
    +1)
        (W uninitialized) An undefined value was used as if it were alread
    +y
    ...
        usually optimized into "that " . $foo, and the warning will refer 
    +to
        the concatenation (.) operator, even though there is no . in your
        program.
    
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    print "$PID|$SID|",shift(@flds),"|$date\n";
    
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    print shift(@flds),"\n";