Secure Copy is a UNIX standard used to transfer files from one computer to another. He's how to use the function in macOS, all via the Terminal window.

Here's how to use the secure copy command, with SSH key authentication, for a more secure way to copy files to your remote Linux servers.

If it works, then you check rsync and Delta Copy. Are you trying to use the root login? - most setups block remote login as root, so you can't login directly as root via ssh.

File transfer protocol, or FTP, is the standard command for transferring files between computer systems. The "sftp" command is a secure version of "ftp" within a SSH session.

Learn how to use the scp command to transfer files securely with this step-by-step tutorial by expert Jack Wallen.