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      $num_processes = `ps -ef | grep $process_name | grep -v grep | wc -l
+`;
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    my $STOP_FILE = 'stopfile';
  3. or download this
    my $STOP_FILE = '/home/user/stopfile';

...
STOP_FILE_PATH='/home/user';

my $STOP_FILE = "$ENV{STOP_FILE_PATH}/stopfile";