SCP is a command that allows you to copy files and directories securely between two hosts.
Upload a file from local to remote host.
scp -i ~/.ssh/id_rsa client.rpm ubuntu@10.x.x.100:/remote/directory
Upload a directory from local to remote host.
scp -i ~/.ssh/id_rsa -r /home/user/documents ubuntu@10.x.x.100:/remote/directory
Download a file from a remote machine.
scp ubuntu@10.x.x.100:/remote/client.rpm /local/directory
Enjoy!