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  1. or download this
    use Fcntl ':flock' ;

open(ONE, ">>C:\\temp\\RTEOlock.log") ;
...

flock(ONE, LOCK_UN) ;
close ONE ;
  2. or download this
    use Fcntl ':flock' ;

open(OUT, ">>C:\\temp\\RTEOlock.log") ;
flock(OUT, LOCK_EX) ;
...