Transfer files and/or folders between 2 remote linux servers using sftp and ssh

gistfile1.txt

* Assuming we have 2 remote linux servers running Ubuntu A and B. Using a Mac and Terminal to run the commands.

1. Connect to one remote server from your computer ( A )
    a) Open Terminal and access the remote server using ssh.
        Example:    ssh -l user server  (name or ip)
        
2. Make the remote server A connect to B using sftp:
        Example:    sftp username@remote_hostname_or_IP
        
3. Use the command pwd to print the current REMOTE working directory (Server B). 
4. Use the command lpwd to print the current LOCAL working directory (Server A).
5. Use ls command and cd command to navigate the REMOTE server A.
6. Use lls command and lcd command to navigate the REMOTE server A.
7. Use the command put, to transfer 1 file from A to B
    Example: put localFile
8. Use the command get to transfer 1 file from B to A.
    Example: get remoteFile
9. Add the -r flag when refering to folders.
10. df -h  checks available space in B
11.

!
df -h

checks available space in A.

12. exit to leave