shell脚本编程之expect

一.expect概述

1.expect介绍

　　expect 是由Don Libes基于Tcl（ Tool Command Language ）语言开发的，主要应用于自动化交互式操作的场景，借助Expect处理交互的命令，可以将交互过程如：ssh登录，ftp登录等写在一个脚本上，使之自动化完成。尤其适用于需要对多台服务器执行相同操作的环境中，可以大大提高系统管理人员的工作效率。

2.expect命令

expect 语法：
　　expect [选项] [ -c cmds ] [ [ -[f|b] ] cmdfile ] [ args ]

常用选项
　　-c：从命令行执行expect脚本，默认expect是交互地执行的
　　　　示例：expect -c 'expect "\n" {send "pressed enter\n"}
　　-d：可以输出输出调试信息
　　　　示例：expect -d ssh.exp

expect中相关命令
　　spawn：
　　　　启动新的进程
　　send：
　　　　用于向进程发送字符串
　　expect：
　　　　从进程接收字符串
　　interact：
　　　　允许用户交互
　　exp_continue 
　　　　匹配多个字符串在执行动作后加此命令

3.安装expect软件包

[root@node101.yinzhengjie.org.cn ~]# yum info expect
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.huaweicloud.com
 * epel: mirrors.aliyun.com
 * extras: mirrors.huaweicloud.com
 * updates: mirrors.aliyun.com
Available Packages
Name        : expect
Arch        : x86_64
Version     : 5.45
Release     : 14.el7_1
Size        : 262 k
Repo        : base/7/x86_64
Summary     : A program-script interaction and testing utility
URL         : http://expect.nist.gov/
License     : Public Domain
Description : Expect is a tcl application for automating and testing
            : interactive applications such as telnet, ftp, passwd, fsck,
            : rlogin, tip, etc. Expect makes it easy for a script to
            : control another program and interact with it.
            : 
            : This package contains expect and some scripts that use it.

[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# yum info expect　　　　　　#查看expect软件包相关信息

[root@node101.yinzhengjie.org.cn ~]# yum -y install expect
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink                                                                                                                                 | 8.6 kB  00:00:00     
 * base: mirrors.aliyun.com
 * epel: mirrors.aliyun.com
 * extras: ap.stykers.moe
 * updates: mirrors.aliyun.com
base                                                                                                                                                 | 3.6 kB  00:00:00     
epel                                                                                                                                                 | 5.3 kB  00:00:00     
extras                                                                                                                                               | 2.9 kB  00:00:00     
updates                                                                                                                                              | 2.9 kB  00:00:00     
(1/2): epel/x86_64/updateinfo                                                                                                                        | 1.0 MB  00:00:06     
(2/2): epel/x86_64/primary_db                                                                                                                        | 6.9 MB  00:00:14     
Resolving Dependencies
--> Running transaction check
---> Package expect.x86_64 0:5.45-14.el7_1 will be installed
--> Processing Dependency: libtcl8.5.so()(64bit) for package: expect-5.45-14.el7_1.x86_64
--> Running transaction check
---> Package tcl.x86_64 1:8.5.13-8.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================
 Package                                Arch                                   Version                                           Repository                            Size
============================================================================================================================================================================
Installing:
 expect                                 x86_64                                 5.45-14.el7_1                                     base                                 262 k
Installing for dependencies:
 tcl                                    x86_64                                 1:8.5.13-8.el7                                    base                                 1.9 M

Transaction Summary
============================================================================================================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 2.1 M
Installed size: 4.9 M
Downloading packages:
(1/2): expect-5.45-14.el7_1.x86_64.rpm                                                                                                               | 262 kB  00:00:06     
(2/2): tcl-8.5.13-8.el7.x86_64.rpm                                                                                                                   | 1.9 MB  00:00:07     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                       294 kB/s | 2.1 MB  00:00:07     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 1:tcl-8.5.13-8.el7.x86_64                                                                                                                                1/2 
  Installing : expect-5.45-14.el7_1.x86_64                                                                                                                              2/2 
  Verifying  : 1:tcl-8.5.13-8.el7.x86_64                                                                                                                                1/2 
  Verifying  : expect-5.45-14.el7_1.x86_64                                                                                                                              2/2 

Installed:
  expect.x86_64 0:5.45-14.el7_1                                                                                                                                             

Dependency Installed:
  tcl.x86_64 1:8.5.13-8.el7                                                                                                                                                 

Complete!
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# yum -y install expect　　 #安装expect工具

二.expect最常用的语法(tcl语言:模式-动作)

1.expect的单分支语法

[root@node101.yinzhengjie.org.cn ~]# expect 
expect1.1> expect "hi" {send "say hi\n"}　　　　　　#捕捉用户输入的"hi",然后给用户发送"say hi\n"
hi　　　　#这一行是我输入的，由于被我上面定义的语句捕捉到了，下面一行的输出信息就是我之前自定义的字符串信息。
say hi
expect1.2> exit　　　　#如果不想使用该程序了可以输入"exit"来正常退出交互式界面
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]#

2.expect的多分支语法

[root@node101.yinzhengjie.org.cn ~]# expect 　　　　　 
expect1.1> expect "hi" {send "say hi\n"}\
+> "bye" {send "byebye\n"}
bye
byebye
expect1.2> exit
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]#
[root@node101.yinzhengjie.org.cn ~]# expect           #匹配hi,hello,bye任意字符串时，执行相应输出。上面的写法和下面的写法功能是相同的。
expect1.1> expect {
+> "hi" {send "You said hi\n"}
+> "hehe" {send "hehe yourself\n"}
+> "bye" {send "Good bye\n"}
+> }
bye
Good bye
expect1.2> 
expect1.2> exit
[root@node101.yinzhengjie.org.cn ~]#

三.expect脚本案例实战

1.spawn(启动新的进程)案例

[root@node101.yinzhengjie.org.cn ~]# ll .ssh/
total 16
-rw-------. 1 root root  413 Jul  9 10:27 authorized_keys
-rw-------. 1 root root 1675 Jul  9 10:27 id_rsa
-rw-r--r--. 1 root root  413 Jul  9 10:27 id_rsa.pub
-rw-r--r--. 1 root root 1608 Jul  9 10:28 known_hosts
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# rm -rf .ssh
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ll /etc/issue
-rw-r--r--. 1 root root 23 Nov 23  2018 /etc/issue
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ll backup/
total 0
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# cat shell/scp_expect.sh
#!/usr/bin/expect　　　　　#注意，这一行需要写expect命令的执行路径
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-29
#FileName：        shell/scp_expect.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

spawn scp /etc/issue root@172.30.1.101:/root/backup

expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "yinzhengjie\n" }
}

expect eof
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# chmod +x shell/scp_expect.sh　　　　#添加执行权限
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ./shell/scp_expect.sh 　　　　　　　　#执行脚本后,我们发现无需像之前那样手动输出"yes"和密码啦~取而代之的是脚本帮咱们干活了。
spawn scp /etc/issue root@172.30.1.101:/root/backup
The authenticity of host '172.30.1.101 (172.30.1.101)' can't be established.
ECDSA key fingerprint is SHA256:KEchoZnVBkijeoWfG2nvx2ptthsXv7IjkxIJYule57g.
ECDSA key fingerprint is MD5:52:c8:f5:6e:5f:cf:44:ec:c4:11:60:d2:d0:31:3c:da.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.30.1.101' (ECDSA) to the list of known hosts.
root@172.30.1.101's password: 
issue                                                                                                                                     100%   23    38.2KB/s   00:00    
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ll backup
total 4
-rw-r--r-- 1 root root 23 Nov 29 19:21 issue
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/scp_expect.sh

2.interact(允许用户交互)案例

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect1.sh 
#!/usr/bin/expect
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-29
#FileName：        shell/scp_expect.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

spawn ssh yinzhengjie@172.30.1.101

expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "yinzhengjie\n" }
}

interact
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ./shell/ssh_expect1.sh 
spawn ssh yinzhengjie@172.30.1.101
yinzhengjie@172.30.1.101's password: 
Last login: Sat Nov 30 17:05:32 2019 from 172.30.1.101
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ who
yinzhengjie pts/1        2019-11-30 17:06 (172.30.1.101)
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ exit 
logout
Connection to 172.30.1.101 closed.
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect1.sh

3.变量使用案例

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect2.sh 
#!/usr/bin/expect
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-29
#FileName：        shell/scp_expect.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

set host 172.30.1.101
set user yinzhengjie
set password yinzhengjie

spawn ssh ${user}@${host}

expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "${password}\n" }
}

interact
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ./shell/ssh_expect2.sh 
spawn ssh yinzhengjie@172.30.1.101
yinzhengjie@172.30.1.101's password: 
Last login: Sat Nov 30 17:09:58 2019 from 172.30.1.101
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ whoami 
yinzhengjie
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ exit 
logout
Connection to 172.30.1.101 closed.
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect2.sh

4.位置参数案例

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect3.sh 
#!/usr/bin/expect
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-29
#FileName：        shell/scp_expect.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

set host [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]

spawn ssh ${user}@${host}

expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "${password}\n" }
}

interact
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ./shell/ssh_expect3.sh 172.30.1.101 yinzhengjie yinzhengjie
spawn ssh yinzhengjie@172.30.1.101
yinzhengjie@172.30.1.101's password: 
Last login: Sat Nov 30 17:10:27 2019 from 172.30.1.101
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ whoami 
yinzhengjie
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ 
[yinzhengjie@node101.yinzhengjie.org.cn ~]$ exit 
logout
Connection to 172.30.1.101 closed.
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect3.sh

5.登录后执行多个命令案例

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect4.sh 
#!/usr/bin/expect
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-29
#FileName：        shell/scp_expect.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

set host [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]
set createuser [lindex $argv 3]
set createpasswd [lindex $argv 4]

spawn ssh ${user}@${host}

expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "${password}\n" }
}

expect "]#" { send "useradd ${createuser}\n" }
expect "]#" { send "echo ${createpasswd} |passwd --stdin ${createuser}\n" }
expect "]#" { send "who\n" }
send "exit\n"
expect eof
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# id jason
id: jason: no such user
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# ./shell/ssh_expect4.sh 172.30.1.101 root yinzhengjie jason 123456
spawn ssh root@172.30.1.101
root@172.30.1.101's password: 
Last login: Sat Nov 30 17:23:11 2019 from 172.30.1.101
[root@node101.yinzhengjie.org.cn ~]# useradd jason
[root@node101.yinzhengjie.org.cn ~]# echo 123456 |passwd --stdin jason
Changing password for user jason.
passwd: all authentication tokens updated successfully.
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/1        2019-11-30 17:27 (172.30.1.101)
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# exit
logout
Connection to 172.30.1.101 closed.
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# id jason
uid=1049(jason) gid=1049(jason) groups=1049(jason)
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect4.sh

6.shell脚本调用expect

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect5.sh  
#!/bin/bash
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-30
#FileName：        shell/ssh_expect5.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

ip=$1
user=$2
password=$3

expect <<EOF
set timeout 10
spawn ssh $user@$ip
expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "$password\n" }
}

expect "]#" { send "useradd jason2019\n" }
expect "]#" { send "echo yinzhengjie |passwd --stdin jason2019\n" }
expect "]#" { send "who\n" }
expect "]#" { send "exit\n" }
expect eof
EOF
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# id jason2019
id: jason2019: no such user
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# bash shell/ssh_expect5.sh 172.30.1.101 root yinzhengjie
spawn ssh root@172.30.1.101
root@172.30.1.101's password: 
Last login: Sat Nov 30 17:27:57 2019 from 172.30.1.101
[root@node101.yinzhengjie.org.cn ~]# useradd jason2019
[root@node101.yinzhengjie.org.cn ~]# echo yinzhengjie |passwd --stdin jason2019
Changing password for user jason2019.
passwd: all authentication tokens updated successfully.
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/1        2019-11-30 17:38 (172.30.1.101)
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# exit
logout
Connection to 172.30.1.101 closed.
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# id jason2019
uid=1050(jason2019) gid=1050(jason2019) groups=1050(jason2019)
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect5.sh

7.模拟给集群批量创建用户的脚本

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect6.sh 
#!/bin/bash
#
#********************************************************************
#Author:        yinzhengjie
#QQ:             1053419035
#Date:             2019-11-30
#FileName：        shell/ssh_expect5.sh
#URL:             http://www.cnblogs.com/yinzhengjie
#Description：        The test script
#Copyright notice:     original works, no reprint! Otherwise, legal liability will be investigated.
#********************************************************************

while read ip ;do
user=root
password=yinzhengjie

expect <<EOF
set timeout 30
spawn ssh $user@$ip
expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" { send "$password\n" }
}

expect "]#" { send "useradd hadoop\n" }
expect "]#" { send "echo yinzhengjie |passwd --stdin hadoop\n" }
expect "]#" { send "who\n" }
expect "]#" { send "exit\n" }
expect eof
EOF
done < /root/shell/iplist.txt
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# cat shell/iplist.txt 　　　　　　#咱们这里定义了需要连接集群的主机IP
172.30.1.101
172.30.1.102
172.30.1.103
172.30.1.104
172.30.1.105
172.30.1.106
172.30.1.107
172.30.1.108
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# bash shell/ssh_expect6.sh 　　　　　　#执行脚本后发现会有很多输出信息，由于我试验的时候之开机了172.30.1.101这台虚拟机，其它虚拟机全部关机了，结果脚本只在开机的虚拟机中执行成功啦，其它主机报错提示找不到主机路由。
spawn ssh root@172.30.1.101
root@172.30.1.101's password: 
Last login: Sat Nov 30 17:38:48 2019 from 172.30.1.101
[root@node101.yinzhengjie.org.cn ~]# useradd hadoop
[root@node101.yinzhengjie.org.cn ~]# echo yinzhengjie |passwd --stdin hadoop
Changing password for user hadoop.
passwd: all authentication tokens updated successfully.
[root@node101.yinzhengjie.org.cn ~]# who
root     pts/1        2019-11-30 17:53 (172.30.1.101)
root     pts/3        2019-11-29 08:24 (172.30.1.254)
root     pts/2        2019-11-29 08:24 (172.30.1.254)
[root@node101.yinzhengjie.org.cn ~]# exit
logout
Connection to 172.30.1.101 closed.
spawn ssh root@172.30.1.102
ssh: connect to host 172.30.1.102 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.103
ssh: connect to host 172.30.1.103 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.104
ssh: connect to host 172.30.1.104 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.105
ssh: connect to host 172.30.1.105 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.106
ssh: connect to host 172.30.1.106 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.107
ssh: connect to host 172.30.1.107 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
spawn ssh root@172.30.1.108
ssh: connect to host 172.30.1.108 port 22: No route to host
expect: spawn id exp6 not open
    while executing
"expect "]#" { send "useradd hadoop\n" }"
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# id hadoop　　　　　　　　#很显然，只有172.30.1.101主机命令执行成功了。
uid=1051(hadoop) gid=1051(hadoop) groups=1051(hadoop)
[root@node101.yinzhengjie.org.cn ~]# 
[root@node101.yinzhengjie.org.cn ~]# 

[root@node101.yinzhengjie.org.cn ~]# cat shell/ssh_expect6.sh

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