ssh :( p lowercase command)
ssh -p port number root @ server ip
scp: (P uppercase command) (- r represents the directory of recursion is copy all the files, including hidden files. "*..")
Upload files to the server
scp -P port number /Users/apple/Desktop/a.pdf root @ server ip: / home / wwwroot
scp -P port number -r /Users/apple/Desktop/.* root @ server ip: / home / wwwroot /
Download server directory index.html file to the local desktop
scp -P port number root @ server ip: /home/wwwroot/index.html / Users / apple / Desktop /
scp -P port number -r root @ server ip: / home / wwwroot /.* / Users / apple / Desktop /