expect的用法

ゝ一世哀愁。 2022-04-27 17:16 193阅读 0赞

### 安装 ###

yum install expect -y

### 关于expect ###

expect #自动应答命令用于交互式命令的自动执行
    spawn  #expect中的监控程序，其运行会监控命令提出的交互式问题
    send   #发送问题答案给交互命令
    "\r"   #表示回车
    exp_continue #当问题不存在时继续回答下边的问题
    expect eof   #问题回答完毕退出expect环境
    interact     #问题回答完毕留在交互界面
    set NAME [ lindex $argv n]  #定义变量

编写一个脚本，为expect的调用做铺垫  
vim [ask.sh][]

#! /bin/bash
    
    read -p "What's your name: " NAME
    read -p "How old are you:" AGE
    read -p "What object do you study: " OBJ
    echo "$NAME is $AGE and study $OBJ"

vim answer.exp

#! /usr/bin/expect
    
    set timeout 2
    
    spawn ./ask.sh
    expect "name"
    send "wangwei\r"
    expect "old"
    send "23\r"
    expect "object"
    send "English\r"
    expect eof

赋予脚本执行权限并执行

chmod u+x ask.sh 
    chmod u+x answer.sh
    [testmsgpub@sd-3-centos249 ~]$ ./answer.sh 
    spawn ./ask.sh
    What's your name: wangwei
    How old are you:23
    What object do you study: English
    wangwei is 23 and study English

### 交互式回答问题 ###

vi answer.exp

#! /usr/bin/expect
    
    set timeout 2
    set NAME [ lindex $argv 0 ]
    set OLD [ lindex $argv 1 ]
    set OBJ [ lindex $argv 2 ]
    spawn ./ask.sh
    expect {
            name { send "$NAME\r";exp_continue}
            old { send "$OLD\r";exp_continue }
            obj { send "$OBJ\r"}
    }
    expect eof

赋予脚本执行权限并执行

chmod u+x ask.sh 
    chmod u+x answer.exp
    [testmsgpub@sd-3-centos249 ~]$ ./answer.exp sdf 23 dfasd
    spawn ./ask.sh
    What's your name: sdf
    How old are you:23
    What object do you study: dfasd
    sdf is 23 and study dfasd

### 注意事项： ###

1、不能使用bash运行expect脚本

[testmsgpub@sd-3-centos249 ~]$ bash answer.exp 
    answer.exp: line 7: spawn: command not found
    couldn't read file "{": no such file or directory
    answer.exp: line 9: name: command not found
    answer.exp: line 9: exp_continue}: command not found
    answer.exp: line 10: old: command not found
    answer.exp: line 10: exp_continue: command not found
    answer.exp: line 11: obj: command not found
    answer.exp: line 12: syntax error near unexpected token `}'
    answer.exp: line 12: `}'

2、expect最后一个问题不能加exp\_continue  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2EyMDA4MjIxNDYwODU_size_16_color_FFFFFF_t_70]  
否则报错：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2EyMDA4MjIxNDYwODU_size_16_color_FFFFFF_t_70 1]

参考：[https://blog.csdn.net/wzt888\_/article/details/80826196][https_blog.csdn.net_wzt888_article_details_80826196]

[ask.sh]: http://ask.sh
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2EyMDA4MjIxNDYwODU_size_16_color_FFFFFF_t_70]: /images/20220121/5caf7d26bb92497ebed91f881d121cff.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2EyMDA4MjIxNDYwODU_size_16_color_FFFFFF_t_70 1]: /images/20220121/6b05e1e3086545799d00950bc07696e7.png
[https_blog.csdn.net_wzt888_article_details_80826196]: https://blog.csdn.net/wzt888_/article/details/80826196