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Listing of hosts in a LAN or domain name group?

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What's the preferred ruby way of listing hosts in a LAN or within a
domain group?

In particular, I am interested in 4 things:
- Listing all connected hosts in a LAN / domain group (assuming
there could be some hosts
that appear and disappear, like wifi hosts -- ie. not just /etc/
hosts ).
- Listing all hosts with a particular condition (say, allowing
authenticated ssh connections).
- Avoiding any hosts that are not in a trusted group (say,
- Doing it fast.

I'm interested in Linux, mainly, but if the solution is multiplatform,
the better.

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