How To Copy An SSH Key To Another Linux Machine
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Copy SSH

Copying your SSH key is a simple and great way to allow for safe ssh communication between your devices.

Create an SSH key

To create an SSH key, you use the ssh-keygen command. It will be saved at the default /.ssh location.

ssh-keygen -t rsa -b 4096 -C "Comment here"

Simplest way

The ssh-copy-id is the simplest way to perform copy of your public SSH key.

ssh-copy-id user@hostname -p <port>

Without password prompt

You can specify the password in the command if you use sshpass, which you need to install.

sshpass -p server_password ssh-copy-id user@IP -p port_number

Without installing anything

This is a basic command that can be run without installing any third-party applications.

cat ~/.ssh/ | ssh <user>@<hostname> 'umask 0077; mkdir -p .ssh; cat >> .ssh/authorized_keys && echo "Key copied"'