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Why would it need to be more complex than "a little bit of bash" if it fulfils the task intended?

Surely that is better than a convoluted, 1,000,000,000 LoC application that no one outside a handful of core developers understands? Right?

I think you and logicrime are saying the same thing.

to be honest most of the work is done by iproute and unshare in this case. unshare basically calls clone() (syscall) with the correct namespace related paramters, iproute deals with veth.

bash is quite a neat language (for what it does) but has horrendous syntax.