Upload local files
scp C:\Users\hanjiale\Downloads\hello.txt hanjiale@121.4.202.81:~/
Upload local directory
scp -r C:\Users\hanjiale\Downloads\lab\ hanjiale@121.4.202.81:~/
Download files from the server
scp hanjiale@121.4.202.81:~/hello.txt C:\Users\hanjiale\Downloads\
Download catalog from server
scp -r hanjiale@121.4.202.81:~/lab/ C:\Users\hanjiale\Downloads\