在两台Linux机器上面建立信任关系以及使用SCP命令复制文件：
操作环境，机器A：10.0.238.81 cognos10用户 ,机器B：10.0.238.114 cognos10用户 A机器IP为 IPA, B机器IP为IPB
1,使用SCP命令将A机器文件temp.txt 传输到B机器/home/cognos/code/cognos/TEMPTEST 目录下面,B机器是用户是cognos10
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[cognos10@biserver ~]$ scp /home/cognos/code/cognos/TEMPTEST/temp.txt cognos10@10.0.238.114:/home/cognos/code/cognos/ TEMPTESTThe authenticity of host '10.0.238.114 (10.0.238.114)' can't be established.
RSA key fingerprint is 62:28:0e:ee:47:13:fe:c6:e1:5d:f5:ec:ab:75:46:e2.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.238.114' (RSA) to the list of known hosts.
cognos10@10.0.238.114's password:
temp.txt 100% 0 0.0KB/s 00:00
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会提示输入B机器cognos10用户的密码，密码填写正确后，传输成功。
2，使用SCP命令将B机器/home/cognos/code/cognos/TEMPTEST 目录下面的temp.txt文件传输到A机器当前目录
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cd /home/cognos/code/cognos/TEMPTEST
SCP cognos10@10.0.238.114:/home/cognos/code/cognos/TEMPTEST/temp.txt .（这里有个点，表示当前目录）
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密码输入正确，传输成功
如果文件名称相同，SCP直接覆盖该文件。
3，使用SCP命令的时候要输入密码，这在写shell脚本的时候很麻烦，下面介绍一下如何不用输入密码
A机器向B机器传输的时候不用输密码的方法：
在两台机器上面建立信任关系，即可解决此问题
----A机器上的操作----
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[cognos10@biserver ~]$ cd /home/cognos10/.ssh
[cognos10@biserver .ssh]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/cognos10/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/cognos10/.ssh/id_rsa.
Your public key has been saved in /home/cognos10/.ssh/id_rsa.pub.
The key fingerprint is:
05:61:d9:7e:33:72:a7:f4:85:48:59:2a:8b:a4:0a:52 cognos10@biserver
The key's randomart image is:
+--[ RSA 2048]----+
| ++ o. |
| .... o. |
| E ..o... . |
| . o oooB o .|
|. . . S .= * . |
| . . . . . |
| . |
| |
| |
+-----------------+
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一直回车下去
执行完成后会在/home/cognos10/.ssh 目录下面生成两个文件 id_rsa,id_rsa.pub
把 id_rsa.pub文件传输到B机器上面，并修改位 authorized_keys.pub
[cognos10@biserver .ssh]$ scp id_rsa.pub cognos10@10.0.238.114:/home/cognos10/.ssh/authorized_keys
再次使用SCP命令由A机器传输到 B机器上面的时候就不会输入密码。
[cognos10@biserver .ssh]$ scp /home/cognos/code/cognos/TEMPTEST/temp.txt cognos10@10.0.238.114:/home/cognos/code/cognos/ TEMPTEST
temp.txt 100% 0 0.0KB/s 00:00
