Which of the following commands can be used to copy an SSH public key to a remote server, allowing the owner of the corresponding private key to log in without a password?Question 13Answera.ssh-copy-id user@remote_hostb.ssh user@remote_host "echo $(cat ~/.ssh/id_rsa.pub) >> ~/.ssh/authorized_keys"c.scp ~/.ssh/id_rsa.pub user@remote_host:~/.ssh/authorized_keysd.echo "$(cat ~/.ssh/id_rsa.pub)" | ssh user@remote_host "cat >> ~/.ssh/authorized_keys"
Question
Which of the following commands can be used to copy an SSH public key to a remote server, allowing the owner of the corresponding private key to log in without a password?Question 13Answera.ssh-copy-id user@remote_hostb.ssh user@remote_host "echo (cat ~/.ssh/id_rsa.pub) >> ~/.ssh/authorized_keys"c.scp ~/.ssh/id_rsa.pub user@remote_host:~/.ssh/authorized_keysd.echo "(cat ~/.ssh/id_rsa.pub)" | ssh user@remote_host "cat >> ~/.ssh/authorized_keys"
Solution
All of the commands listed can be used to copy an SSH public key to a remote server. However, they work slightly differently:
a. ssh-copy-id user@remote_host - This is the most straightforward command. It automatically copies your public key to the remote host and appends it to the ~/.ssh/authorized_keys file.
b. ssh user@remote_host "echo $(cat ~/.ssh/id_rsa.pub) >> ~/.ssh/authorized_keys" - This command first reads your public key file, then logs into the remote server and appends the key to the ~/.ssh/authorized_keys file.
c. scp ~/.ssh/id_rsa.pub user@remote_host:~/.ssh/authorized_keys - This command copies the public key file to the remote server using the secure copy protocol (scp). However, it overwrites any existing authorized_keys file on the remote server, which might not be what you want.
d. echo "$(cat ~/.ssh/id_rsa.pub)" | ssh user@remote_host "cat >> ~/.ssh/authorized_keys" - This command works similarly to option b, but it uses a pipe to redirect the output of the local cat command to the remote cat command. This means it doesn't need to create a temporary file or use echo.
So, all of these commands can be used to copy an SSH public key to a remote server, but they have slightly different behaviors. The ssh-copy-id command is probably the safest and easiest to use.
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