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For example, I often need to login to a new virtual machine just to open "/etc/ssh/sshd_config" and set "PasswordAuthentication" option to "no".

In this way, I can not automate this process.

How to solve similar tasks by doing the modification from the command line?

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sudo sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/ssh_config

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