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OpenSSH: ssh-add / ssh-agent Command Set Maximum Lifetime In Seconds

I'm using a Mac OS X and combination of ssh-agent+ssh-add to adds RSA or DSA identities to the authentication agent. ssh-agent provides me a secure way of storing the private key. However, I'd like to expire identities added to the agent within half an hour. How do I set lifetime of identities added to the agent under Unix / Linux / BSD / Apple OS X operating systems?
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Linux: Determine the Manufacturer of a PCI Device

How do I determine the manufacturer of a PCI device under Linux operating systems?
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How do I Be More Productive In Vim?

This is a user contributed FAQ.

Q. I'm just starting in vim text editor but I'm annoying typing and retyping similar statements. Can you address me about it?
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