Self Replicating Software

See SelfReplication

There's a lot of useful content on the SelfReplication page. However, I have a question that relates specifically to SelfReplicatingSoftware. We all know about malicious self-replicating software (viruses, worms, etc.). But are there any extant examples of useful self-replicating software? I have heard it suggested that one could create an "anti-worm", a worm that traverses a network eliminating a malicious worm, but has this actually been done? And are there any other applications of beneficial self-replicating software?


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