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```
#!/usr/bin/perl

...

    return 1;
}
```

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$ perl test.pl  --> should run if there is no test.pl running.
$ perl test.pl  ---> should abort if there is a test.pl running alread
+y.
$ perl test.pl --test  --> should run even if test.pl is already runni
+ng.
$ perl test.pl --test  --> should abort if there is a (test.pl --test)
+ running as well.