sudo bash -c 'cp /etc/ssh_config /etc/ssh_config.back; (echo -e "Host *\n Protocol 2"; cat /etc/ssh_config.back) > /etc/ssh_config'
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sudo bash -c 'cp /etc/ssh_config /etc/ssh_config.back; (echo -e "Host *\n Protocol 2"; cat /etc/ssh_config.back) > /etc/ssh_config'