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# To generate an SSH key:
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ssh-keygen -t rsa
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# To generate a 4096-bit SSH key:
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ssh-keygen -t rsa -b 4096
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# To copy a key to a remote host:
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ssh-copy-id username@host
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# To copy a key to a remote host on a non-standard port:
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ssh-copy-id username@host -p 2222
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