Run this command in your terminal:
scp your_username@remotehost.edu:foobar.txt /local/dir
change the username, filename, host, directory as desired. Use the -i option if you plan on using EC2 (or any other service that needs a private key)
scp -i key_file.pem your_username@remotehost.edu:/remote/dir/foobar.txt /local/dir
From: http://www.hypexr.org/linux_scp_help.php