expect 两种用法

yum install expect -y
#先安装expect

1.测试用法

#!/usr/bin/expect
#解释语言，这边运行要以./运行，bash运行会报错
spawn ssh root@192.168.0.14
#启动新的进程
expect "*password:"
#进程接收字符串，匹配
send "yxy7714707@\r"
#前面匹配到了就输入 “ ” 里的内容
expect "*#"
send "ifconfig>>123.txt\r"
send "exit\r"
interact

2.在sh脚本里调用

#!/bin/bash 
ip=$1
#传递参数
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" }
    } 
        #一个交互用一个expect{} 括起来，这个交互就是登录的
    expect "]#" { send "date>>123.txt\n" } 
    expect "]#" { send "exit\n" } 
        #退出
expect eof 
EOF

3.实战程序（传递公钥文件实现无密码登陆）

#!/bin/bash
x=`cat .ssh/id_rsa.pub`
ip=$1
password=$2
if [ ! -f "/root/.ssh/id_rsa.pub" ];then
  echo "文件不存在"
expect <<EOF
  set timeout -1
  spawn ssh-keygen -t rsa
  expect {
         "Enter file in which to save the key (/root/.ssh/id_rsa):" { send "\r"; exp_continue}
#简写   "*(/root/.ssh/id_rsa):" { send "\r"; exp_continue}
         "Enter passphrase (empty for no passphrase):" { send "\r"; exp_continue} 
         "Enter same passphrase again:" { send "\r"; exp_continue} 
         }
                 #生成私钥 公钥文件（.ssh里的 id_rsa  id_rsa.pub的两个文件）
 expect eof
EOF
fi

expect <<EOF
set timeout 10
spawn ssh-copy-id $ip
expect { 
        "connecting (yes/no)?" { send "yes\n";exp_continue }
                #保存对方的密码指纹
        "password:" { send "$password\n" }
                #输入密码
 }

expect eof
EOF

4.实战程序2

#!/bin/bash 
expect <<EOF  
    set timeout 10 
    spawn bash /root/***.sh  #打开某个脚本
    expect "请输入数字" { send "14\n" }  
    expect "默认:" { send "6\n" } 
expect eof
EOF

PS ：注意匹配为模糊匹配，能够不用写全，写个关键字便可