expect 兩種用法

yum install expect -y
#先安裝expect

1.測試用法

#!/usr/bin/expect
#解釋語言，這邊運行要以./運行，bash運行會報錯
spawn ssh root@192.168.0.14
#啓動新的進程
expect "*password:"
#進程接收字符串，匹配
send "yxy7714707@\r"
#前面匹配到了就輸入 「 」 裏的內容
expect "*#"
send "ifconfig>>123.txt\r"
send "exit\r"
interact

2.在sh腳本里調用

#!/bin/bash 
ip=$1
#傳遞參數
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" }
    } 
        #一個交互用一個expect{} 括起來，這個交互就是登錄的
    expect "]#" { send "date>>123.txt\n" } 
    expect "]#" { send "exit\n" } 
        #退出
expect eof 
EOF

3.實戰程序（傳遞公鑰文件實現無密碼登陸）

#!/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}
#簡寫   "*(/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} 
         }
                 #生成私鑰 公鑰文件（.ssh裏的 id_rsa  id_rsa.pub的兩個文件）
 expect eof
EOF
fi

expect <<EOF
set timeout 10
spawn ssh-copy-id $ip
expect { 
        "connecting (yes/no)?" { send "yes\n";exp_continue }
                #保存對方的密碼指紋
        "password:" { send "$password\n" }
                #輸入密碼
 }

expect eof
EOF

4.實戰程序2

#!/bin/bash 
expect <<EOF  
    set timeout 10 
    spawn bash /root/***.sh  #打開某個腳本
    expect "請輸入數字" { send "14\n" }  
    expect "默認:" { send "6\n" } 
expect eof
EOF

PS ：注意匹配爲模糊匹配，能夠不用寫全，寫個關鍵字便可