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Host server1
    Hostname 192.168.1.100
    User myuser
    Port 22
    IdentityFile ~/.ssh/id_rsa

Host server2
    Hostname 192.168.1.101
    User myuser
    Port 22
    IdentityFile ~/.ssh/id_rsa

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ssh server1

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ssh-keygen -t rsa

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ssh-copy-id server

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ssh server

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ssh -J jumpuser@jumpserver destinationuser@destinationserver

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for server in $(cat servers.txt); do ssh $server “command”; done

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ssh -L localport:localhost:remoteport server

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