Linux

简单模式：

#!/usr/bin/expect -f   
set timeout 5   
spawn ssh root@192.168.0.1
expect "*assword*"   
send "root
"   
expect "#"   
send "ifconfig 
"   
expect eof

讲解：

send：用于向进程发送字符串
expect：从进程接收字符串 比如：expect "*assword*"

spawn：启动新的进程
interact：允许用户交互

怎么使用变量：

#!/usr/bin/expect -f
set port 22
set user root
set host 192.168.0.12
set password root
set timeout -1
spawn ssh -D $port $user@$host "ifconfig"
expect {  
"*yes/no" { send "yes
"; exp_continue}  
"*assword:" { send "$password
" }  
}  
expect "*#*"  
send "ifconfig > /home/cfg 
"
send "exit
"
}

讲解：

expect {  
"*yes/no" { send "yes
"; exp_continue}  
"*assword:" { send "$password
" }  
}  
选择模式，exp_continue表示继续。

通过读取配置文件获取变量：
配置文件

192.168.0.1 root
192.168.0.2 root

   自动化登录脚本

#!/usr/bin/expect -f
set f [open ./ip r]  
while { [gets $f line ]>=0 } {       
set ip [lindex $line 0]     
set pwd [lindex $line 1]
spawn ssh $ip
expect  "*password:" { send "$pwd
" }
expect "#"
send "ifconfig 
"
send "exit
"
interact
}

讲解：

可以多台服务器循环执行，是个非常使用的方式！

自动化远程拷贝文件：

#!/usr/bin/expect -f
set port 22
set user root
set host 192.168.28.30
set password root
set timeout -1
spawn scp $host:/home/cfg ./
expect {
"*yes/no" { send "yes
"; exp_continue}
"*assword:" { send "$password
" }
}
expect eof

讲解：

原理和ssh一样

远程执行命令后写入文件，再通过scp到本机服务器：

#!/usr/bin/expect -f

set port 22
set user root
set host 192.168.28.30
set password root
set timeout -1
spawn ssh -D $port $user@$host "ifconfig"
expect {
"*yes/no" { send "yes
"; exp_continue}
"*assword:" { send "$password
" }
}
expect "*#*"
send "ifconfig > /home/cfg 
"
send "exit
"
interact
spawn scp $host:/home/cfg ./
expect {
"*yes/no" { send "yes
"; exp_continue}
"*assword:" { send "$password
" }
}
expect eof

讲解：

自动化运维，远程交互从服务器A上ssh到服务器B上，然后执行服务器B上的命令。

http://www.cnblogs.com/Javame/p/4272440.html