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help: Enable/disable Secure SHell (SSH) protocol
delete:expression: "sudo /usr/sbin/invoke-rc.d ssh stop && \
         sudo sh -c \"echo 'SSHD_OPTS=' > /etc/default/ssh\" "
end:expression: "if [ -z \"$VAR(port/@)\" ]; then exit 0; fi; \
      sudo sh -c \
        \"[ -f /etc/ssh/ssh_host_key ] \
            || sudo ssh-keygen -t rsa1 -N '' -f /etc/ssh/ssh_host_key\"; \
      case \"$VAR(protocol-version/@)\" in \
        v2) VER=2;; \
        v1) VER=1;; \
        all) VER=\"1,2\";; \
        *) VER=2;; \
      esac; \
      STR=\"SSHD_OPTS=\\\"-p $VAR(port/@) -o HostKey=/etc/ssh/ssh_host_key \
-o Protocol=${VER}\\\"\"; \
      sudo sh -c \"echo '$STR' > /etc/default/ssh\"; \
      sudo /usr/sbin/invoke-rc.d ssh restart"