scp /home/andy/andy.txt username@ip:/home/dir_name/
scp username@ip:/home/dir_name/andy.txt /home/dir_name
scp work@192.168.0.10:/home/work/source.txt work@192.168.0.11:/home/work/
scp -r /home/work/sourcedir work@192.168.0.10:/home/work/
scp -P <端口号> /home/andy/andy88.txt username@ip:/home/hanzhao/