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Protects your secret identity with a passphrase.
OSX 10.6 automatically does key forwarding and can store the passphrase in the keychain.
For other OSes, use ssh -A or set ForwardAgent in ssh_config to enable forwarding. Then use ssh-agent/ssh-add.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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