FLOM is a distributed lock manager that can be used to avoid shell tricks and safely execute different tasks that cannot run at the same time. It manages process serialization in the same way nice manages process prioritization. It implements the same lock mode semantic proposed by VMS DLM to allow non-trivial command serialization use cases. The goal is to "just work"; everything implemented must be useful and easy to use (configuration is reduced to a bare minimum). It works inside a single system or in a network of IP connected systems.