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  1. or download this
    open HANDLE, "$file" or die "Can't open: $!";
flock(HANDLE, LOCK_SH);  #could use LOCK_EX, it doesn't prevent this p
+roblem
  2. or download this
    open WRITER, ">$file" or die "Can't open: $!";
flock(WRITER, LOCK_EX);