You can check the version of SSH (Secure Shell) on an Ubuntu server by running the following command in the terminal:

$ ssh -V

This will display the version of the SSH client installed on your system. If you want to check the version of the SSH server, you can connect to the server using SSH and run the same command.

Alternatively, you can check the version of the OpenSSH package installed on your Ubuntu server by running the following command:

Working with Git will make it more efficient using SSH keys, since you do not have to constantly enter in your username and password or personal access token. Make sure your Git site URL is set to use the SSH URL for your repo.

Generating an SSH key

1. Open Terminal
2. Generate your key pair using your email address

   $ ssh-keygen -t ed25519 -C "your.email@example.com"
   Generating public/private ed25519 key pair

3. When prompted to "Enter a file in which to save the key," press Enter to accept the default file location

   $ Enter file in which to save the key (~/.ssh/id_ed25519): ~/.ssh/[id_keyfile]

4. At the prompt, simply press enter for an empty passphrase

   $ Enter passphrase (empty for no passphrase): [press enter]
   $

Rsync (remote sync) is a linux utility to synchronize local and remote files and directories, mainly used in terminal.

I use this mainly in downloading/uploading files and directories from and to remote servers or even local files. I use rsync as well with shell scripts for backups that are ran automatically daily using the crontab utility.