expect 免交互

expect（伊克斯拜可特）

vim test.exp

#!/usr/bin/expect -f
set timeout 10
spawn ssh root@192.168.10.18
expect {
        "yes/no" { send "yes\r"; exp_continue}
        "*password:" { send "123456\r"}
        timeout {puts "expeck connect timeout,pls contact admin_tao."; return}
        }
interact

语句解析

set timeout 10 等待退出时间10秒
spawn   执行一条语句（脚本或命令）
expect  等待一个进程的反馈，接收一个字符参数"冒号中的参数" 可以接收正则匹配
send    接收一个参数“冒号中的参数”并将该参数发给进程
\r      回车 
\n      换行 
\t      TAB
exp_continue 重新从当前expect

安装

yum install expect
apt install expect

结合入脚本

vim test.exp

#!/bin/bash/expect -f
if { $argc != 2 } {
    send_user "usage: expect test.exp MBC_IP PASSWORD\n "
    exit
}
set BMC_IP [ lindex $argv 0 ]
set password [ lindex $argv 1 ]
set timeout 10

spawn ssh sysadmin@$BMC_IP
expect { 
        "yes/no" { send "yes\r"; exp_continue}
        "*password:" { send "$password\r"}
        timeout {puts " boss timeout !!!!!!!!!! "; return}
}
expect eof

exit -onexit {
    send_user "admin_tao good bye to you !\n"
}

解析语句

if { $argc != 2 } {                                   #判断接的参数如果不等于2个
    send_user "usage: expect test.exp file host\n "   #则输出usage: expect test.exp BMC_IP PASS 用法
    exit                                              #并退出
}

set BMC_IP [ lindex $argv 0 ]   # 脚本后跟的第一个参数 (类似 BMC_IP=$1)
set password [ lindex $argv 1 ] # 脚本后跟的第二个参数（类似 password=$2）
set timeout 10                  # 10秒超时
spawn ssh sysadmin@$BMC_IP      # 后跟要执行的交互命令 ,ssh 用户名@$BMC_IP  $BMC_IP是$1
expect {                        # 固定格式
    "yes/no" 匹配的内容 { send "yes\r" 匹配后输入的内容YES ; exp_continue}  连续匹配内容就要用到
    "*password:" 匹配的内容 { send "$password\r"}  匹配后输入的内容YES（可以是变量）
    timeout {puts " boss timeout !!!!!!!!!! "; return}  超时打印信息
}
expect eof                      固定格式结束

实例1：免交互分发秘钥脚本

# 1 fenfa_sshkey.exp
vim fenfa_sshkey.exp

if { $argc != 3 } {
    send_user "usage: expect fenfa_key.exp file host\n "
    exit
}

set file [ lindex $argv 0 ]
set host [ lindex $argv 1 ]
set password "zoomtech"
set timeout 10

spawn ssh-copy-id -i $file "-p 22 dev@$host"
expect { 
        "yes/no" { send "yes\r";exp_continue}
        "*password:" { send "$password\r"}
        timeout {puts "expeck connect timeout,pls contact admin_tao."; return}
}
expect eof

# 2 fenfa_sshkey.sh

vim fenfa_sshkey.exp
#!/bin/sh
cd /server/scripts
. /etc/init.d/functions
for iplist in `cat iplist.txt`
do
  expect fenfa_sshkey.exp ~/.ssh/id_dsa.pub $iplist >/dev/null
  if [ $? -eq 0 ]
    then
      action "$iplist" /bin/true
    else
      action "$iplist" /bin/false
  fi
done

# 3 iplist.txt
    192.168.1.200
    192.168.1.201
# 4 清除ssh记录
    >~/.ssh/known_hosts