scp：是基于ssh的，如果ssh没有启动，那么就使用不了。
[root@localhost test]# touch /hh.txt
[root@localhost test]# scp /hh.txt [email protected]:/ 相当于将/hh.txt文件传到192.168.146.138上面
The authenticity of host '192.168.146.138 (192.168.146.138)' can't be established.
ECDSA key fingerprint is c6:7a:1b:03:9a:bf:3c:80:a3:58:d0:84:0d:f5:b8:e5.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.146.138' (ECDSA) to the list of known hosts.
[email protected]'s password:
hh.txt 100% 0 0.0KB/s 00:00
[root@localhost test]# scp [email protected]:/hh.txt / 相当于下载192.168.146.138上面的hh.txt文件到本机的根目录/下面
[root@server0 ~]# scp -r /test root@desktop0:/ --使用-r选项递归目录，将目录传输过去
root@desktop0's password:
file1 100% 0 0.0KB/s 00:00
file2 100% 0 0.0KB/s 00:00
file3 100% 0 0.0KB/s 00:00
在拷贝的过程当中，注意文件的所有者会发生改变，每次传输完毕最好查看一下文件所有者和其他人以及相对应的权限
[root@server0 ~]# su - test
Last login: Tue Apr 10 03:31:16 CST 2018 on pts/0
[test@server0 ~]$ touch test.txt
[test@server0 ~]$ ls -l
total 0
-rw-rw-r--. 1 test test 0 Apr 10 03:35 test.txt
[test@server0 ~]$ su - root
Password:
Last login: Tue Apr 10 03:12:27 CST 2018 from 172.25.0.250 on pts/0
[root@server0 ~]# scp /home/test/test.txt root@desktop0:/ --用root身份将test用户的文件拷贝过去，这样文件的所有者会发生改变
root@desktop0's password:
test.txt 100% 0 0.0KB/s 00:00
[root@server0 ~]# ssh root@desktop0
root@desktop0's password:
Last login: Tue Apr 10 03:33:02 2018 from server0.example.com
[root@desktop0 ~]# ls -l /test.txt
-rw-r--r--. 1 root root 0 Apr 10 03:36 /test.txt
fstp
[root@localhost test]# sftp [email protected] --sftp相对于客户端，以root身份登入到192.168.146.138上面去取文件
[email protected]'s password:
Connected to 192.168.146.138.
sftp> pwd
Remote working directory: /root
sftp> ls
anaconda-ks.cfg initial-setup-ks.cfg
sftp> get anaconda-ks.cfg
Fetching /root/anaconda-ks.cfg to anaconda-ks.cfg
/root/anaconda-ks.cfg 100% 1872 1.8KB/s 00:00
sftp> bye
注意下载的位置是当前目录。上面就相当于ftp的客户端。scp命令是不会登入到远程主机上面的，但是ftp相对于客户端可以登入到远程主机拿自己想要的文件。
Synchronize files and floaders with rsync
The rsync tool is another way to securely copy files from one system to another.it differs from scp in that if two files or directories are similar between two system,rsync only need to copy the differences between the systems,while scp would need to copy everything.
rsync：如果在目的端有相同的文件，那么如果在源端，该文件发生改变会将其拷贝过去，如果和目的端文件一样那么就不拷贝
[root@localhost test]# rsync -av /hh.txt [email protected] /tmp
sending incremental file list
hh.txt
sent 134 bytes received 50 bytes 368.00 bytes/sec
total size is 0 speedup is 0.00
因为主机192.168.146.138的/tmp下面已经有了hh.txt文件，所以不会将其copy过去。只会增量的进行copy。只要文件发生改变就会拷贝过去而不是文件名相同就不会拷贝过去。