SSH public key Registration Procedure(mac)

🆀 When I typed `ssh -V` and executed it, and the output is `-bash: ssh: command not found`.

🅐 OpenSSH client is not installed, so first execute the following command to install it.

sudo apt update
sudo apt upgrade
sudo apt install -y ssh openssh-client
```
Next, execute the following command.
```
ssh -V

When the version of the OpenSSH client software is displayed as follows after executing the command, the installation is completed.