How to get the private keys out of old wallet.dat without syncing blockchain

I have old wallet.dat files of Bitcoin, Litecoin, Bitcoin Cash, Omnicore. My Bitcoin Cash wallet.dat has unbroadcasted transactions inside, so I am afraid that others might also have unbroadcasted transactions. So, currently nodes are not running and I want to dump private keys of those wallets and import into new wallets in a way so…

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How to give my network card a configuration without losing it when the other end of cable is a switch turned off during night?

How to give my network card a configuration without losing it when the other end of cable is a switch turned off during night? Is ubuntu server up to the task of server ? (Contemplating moving to AlpineLinux…any hints ?) This setup worked with 14.04 … I am trying to setup two redundant(High Availability) Ubuntu…

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