Getting a unique id from a unix-like system

Question

I want to get from any Unix-like system (if this is possible) a unique id that will be persistent every time my application runs in the same machine. If it is possible, I wa

Answer 1

You have to consider that a lot of setups may have created a filesystem image and cloned to many machines, rather than setting them up individually. In other cases, a machine could get re-setup many times. In other words, anything the OS provided can't be trusted.

However, the CPU does keep a unique serial number, but access to it should be different on different systems.