Centos7 shell下的expect 免交互实现

Centos7 shell下的expect 免交互实现

1.下载

yum install -y expect

2.使用

#!/usr/bin/expect
spawn +command
expect {"希望匹配到的元素" { send "希望输出的内容";exp_continue }"希望匹配到的元素" { send "希望输出的内容" };
}
interact

spawn expect 内部命令，启动一个shell程序。
expect 期望哪些内容
””内输入希望匹配到的问题 ，r 表示回车
send后的””内输入当遇到匹配到的问题时需要交互执行的动作
exp_continue，跳过循环，就继续下一条语句。
interact 允许用户交互
3.示例
Eg1: 用expect脚本实现远程登录

#!/usr/bin/expect
spawn ssh root@192.168.80.170
expect {"password:" { send "liu13881044103r"};
}
Interact

Eg1: expect+shell 实现批量推送密匙
ip.text:从机ip集合文件

192.168.80.170

keygen_expect.sh：主机执行文件

#!/bin/bash
if [ x"$1" = x ] ;thenecho "ip文件不存在"exit
fi
/usr/bin/expect<<-EFO
spawn ssh-keygen -t rsa
expect {"Enter file in which to save the key (/root/.ssh/id_rsa):" { send "r";exp_continue};"Overwrite (y/n)?" { send "yr";exp_continue};"Enter passphrase (empty for no passphrase):" { send "r";exp_continue};"Enter same passphrase again:" { send "r";exp_continue};
}
EFOwhile read ip;doping -c1 -w1 $ipif [ $? -ne 0 ];thenecho "ping $ip is error"continuefi /usr/bin/expect<<-EFOspawn scp /root/.ssh/id_rsa.pub /root/install_keygen.sh root@$ip:/root/expect {"password:" { send "liu13881044103r";exp_continue};}EFO/usr/bin/expect<<-EFOspawn ssh root@$ip "chmod a+x /root/install_keygen.sh; bash /root/install_keygen.sh"expect {"password:" { send "liu13881044103r";exp_continue};}EFOecho "create $ip ssh-keygen successful"done<$1

install_keygen.sh 从机执行文件

#!/bin/bash
[ -e /root/.ssh/authorized_keys ]
if [ $? -ne 0 ];thenecho "/root/.ssh/authorized_keys not exist"[ -e id_rsa.pub ]if [ $? -ne 0 ];thenecho "id_rsa.pub not exist"exitfimkdir /root/.ssh &>/dev/nullif [ $? -eq 0 ];thencat id_rsa.pub>>/root/.ssh/authorized_keysstatus=$?fielse[ -e id_rsa.pub ]if [ $? -ne 0 ];thenecho "id_rsa.pub not exist"exitfiif [ $? -eq 0 ];thencat id_rsa.pub>>/root/.ssh/authorized_keysstatus=$?fifi
if [ $status -eq 0 ] ; thenecho 'successful'
elseecho 'error'
fi