scp file.txt user@remote:/path/to/destination transfers the local file file.txt to the remote host at /path/to/destination.scp -r /path/to/local/folder user@remote:/path/to/destination recursively copies the local directory /path/to/local/folder to the remote host at /path/to/destination.scp user@remote:/path/to/remote/file file.txt downloads the remote file /path/to/remote/file to the local file file.txt.scp -P 2222 file.txt user@remote:/path/to/destination transfers the file file.txt to the remote host at /path/to/destination using a non-default port (2222).scp -r user@remote:/path/to/remote/folder /path/to/local/destination copies the directory /path/to/remote/folder from the remote host to /path/to/local/destination locally.