分发系统——expect 原

[root@z1 ~]# yum install -y expect

远程登录一台主机：
[root@z1 ~]# ssh 192.168.8.138
Are you sure you want to continue connecting (yes/no)? yes
root@192.168.8.138's password: 
Last login: Wed Sep 20 18:36:21 2017 from 192.168.8.1
#如果是第一次登录，则会提示(yes/no)，如果之前登陆过则不会提示
#那么如何使其再次提示呢？  

[root@z1 ~]# vim /root/.ssh/known_hosts
##编辑该文件，将其中内容清空即可。

[root@z1 ~]# vim 1.expect
#! /usr/bin/expect
set host "192.168.8.138"
#连接到主机192.168.8.138
set passwd "123456"
#密码
spawn ssh root@$host
#spawn调用shell命令ssh（登录），“set host”和“set passwd”为expect定义的两个变量
expect {
"yes/no" { send "yes\r"; exp_continue}
#ssh首次远程登录一台主机是会提示yes/no;"\r“表示回车
"assword:" { send "$passwd\r" }
#密码
}
interact
#interact的作用是停留在远程机器上，不退出
#expect脚本结束符号：expect eof——执行结束后暂停几秒钟后退出
#如果不加任何结束符号，命令执行完后马上退出

更改文件权限：
[root@z1 ~]# chmod a+x 1.expect 

执行该脚本：
[root@z1 ~]# ./1.expect 
spawn ssh root@192.168.8.138
The authenticity of host '192.168.8.138 (192.168.8.138)' can't be established.
ECDSA key fingerprint is 79:63:d9:ee:35:ad:f3:41:8d:45:b0:3b:c2:53:f6:f2.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.8.138' (ECDSA) to the list of known hosts.
root@192.168.8.138's password: 
Last login: Wed Sep 20 18:45:04 2017 from 192.168.8.136
[root@z2 ~]# 

[root@z1 ~]# vim 2.expect
#!/usr/bin/expect
set user "root"
set passwd "123456"
spawn ssh $user@192.168.8.138

expect {
"yes/no" { send "yes\r"; exp_continue}
"password:" { send "$passwd\r" }
}
expect "]*"
#匹配到“]”时执行下面的命令
send "touch /tmp/12.txt\r"
expect "]*"
send "echo 1212 > /tmp/12.txt\r"
expect "]*"
send "exit\r"

[root@z1 ~]# chmod a+x 2.expect 

执行脚本：
[root@z1 ~]# ./2.expect 
spawn ssh root@192.168.8.138
root@192.168.8.138's password: 
Last login: Wed Sep 20 18:51:51 2017 from 192.168.8.136
[root@z2 ~]# touch /tmp/12.txt
[root@z2 ~]# echo 1212 > /tmp/12.txt
[root@z2 ~]# 
[root@z1 ~]# 

[root@z2 ~]# cat /tmp/12.txt 
1212

[root@z1 ~]# vim 3.expect
#!/usr/bin/expect
#调用expect内置变量：“[lindex $argv 0]”、“[lindex $argv 1]”、“[lindex $argv 2]”
set user [lindex $argv 0]
set host [lindex $argv 1]
set passwd "123456"
set cm [lindex $argv 2]
spawn ssh $user@$host

expect {
"yes/no" { send "yes\r"}
"password:" { send "$passwd\r" }
}
expect "]*"
send "$cm\r"
expect "]*"
send "exit\r"

更改权限：
[root@z1 ~]# chmod a+x 3.expect 

执行脚本：
[root@z2 ~]# [root@z1 ~]# ./3.expect root 192.168.8.138 ls;w
spawn ssh root@192.168.8.138
root@192.168.8.138's password: 
Last login: Wed Sep 20 19:12:48 2017 from 192.168.8.136
[root@z2 ~]# ls
anaconda-ks.cfg
[root@z2 ~]#  19:14:04 up 41 min,  2 users,  load average: 0.02, 0.02, 0.08
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
root     tty1                      18:33   37:36   0.15s  0.15s -bash
root     pts/0    192.168.8.1      18:36    4.00s  0.19s  0.01s w