SCP transmission between server file or directory

1. SCP command gets the directory on the remote server: scp -P port -r user @ ip: / home / xxx / / home / xxx /
2. SCP command gets the files on a remote server: scp -P port user @ ip: /home/xxx.xxx /home/xxx.xxx
3. SCP command will upload local directory to a remote server: scp -P port -r / home / xxx / user @ ip: / home / xxx /
4. SCP command to upload local files to a remote server: scp -P port /home/xxx.xxx user @ ip: /home/xxx.xxx