shell——expect

安装expect

rpm -qa expect    #查看是否安装
yum install expect -y

 

bash脚本使用expect自动应答

修改用户密码

#!/bin/bash
expect <<EOF &>/dev/null
spawn passwd $1    #产passwd命令
expect "rd:"    #当结尾停在rd:时
send "$2\r"    #把$2传给它
expect "rd:"
send "$2\r"
expect eof    #结束expect
EOF

expect实现ssh

#!/bin/bash
sed -i '/^'$1'/d' /root/.ssh/known_hosts
expect <<EOF &>/dev/null
spawn ssh $1
expect "no)?"
send "yes\r"
expect "password:"
send "$2\r"
expect "# "
send "touch /home/test\n"
send "exit\n"
expect eof
EOF

 

exp脚本

cat test.exp
#!/usr/bin/expect
spawn passwd $1    #产passwd命令
expect "rd:"    #当结尾停在rd:时
send "$2\r"    #把$2传给它
expect "rd:"
send "$2\r"
expect eof    #结束expect

执行脚本：expect test.exp

 

expect多次匹配

#!/usr/bin/expect
spawn passwd user
expect {
        "rd:"   {send "12345\r";exp_continue}
}
expect eof

 

脚本变量

#!/usr/bin/expect
set user [lindex $argv 0]　　#把第一个参数赋值给变量user
set password [lindex $argv 1]　　#把第二个参数赋值给password
spawn passwd $user
expect {
        "rd:"   {send "$password\r";exp_continue}
}
expect eof

执行：expect test.exp abc 12345

 

timeout

#!/usr/bin/expect
spawn ssh root@192.168.20.252 uptime
set timeout 3    #设置超时时间3秒
expect "yes/no"
send "yes/r"
expect timeout
send_user "timeout~"    #终端打印
return    #退出

#!/usr/bin/expect
spawn ssh root@192.168.20.252 uptime
expect {
    -timeout 3
    "yes/no"    {send "yes\r";exp_continue}
    timeout     {send_user "timeout~";return}
}

# -time 0 表示立即超时，-1 永不超时