WINSCP

 ssh--no root, ssh key

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sudo visudo

youruser ALL=(ALL) NOPASSWD: ALL

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protocol     scp

Advance ---> SCP/Shell ----> sudo su -

Authentication ------> private key location

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echo "# configuration here" | sudo tee /root/file.conf > /dev/null

sudo chmod 600 /root/file.conf

sudo chown root:root /root/file.conf