how-to-add-multiple-authorized-keys

To add multiple authorized keys for a user in Ubuntu, you can follow these steps:

Create a directory named .ssh in the user's home directory, if it doesn't already exist. You can do this with the following command:
	mkdir -p ~/.ssh

Change the permissions on the .ssh directory to 700 (read, write, and execute for the owner only):
	chmod 700 ~/.ssh

Create a file named authorized_keys in the .ssh directory. You can do this with the following command:
	touch ~/.ssh/authorized_keys

Open the authorized_keys file in a text editor.

Copy and paste each public key that you want to add into a new line in the authorized_keys file.

Save and close the authorized_keys file.

Change the permissions on the authorized_keys file to 600 (read and write for the owner only):
	chmod 600 ~/.ssh/authorized_keys

After completing these steps, the user will be able to log in via SSH using any of the public keys that you added to the authorized_keys file.

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