深入解析Expect脚本：自动化交互式任务从未如此简单！

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深入解析Expect脚本：自动化交互式任务从未如此简单！

expect 脚本总结。

关于一些基础知识和基础示例，可参考：

linux shell之expect 教程

expect实用示例

（1）声明函数和调用函数

2. proc insertDebianUserIfNo {username password} {
3. send "use mysql\r"
4. expect "*Database changed*"
5. send "select User from user where User='$username';\r"
6. expect {
7. "*Empty set*" {
8. puts "数据库 $username 帐号不存在，尝试创建\n"
9. send "create user '$username'@'localhost' identified by '$password';\r"
10. expect "*Query OK*"
11. send "flush privileges;\r"
12. expect "*Query OK*"
13. send "grant ALL PRIVILEGES ON *.* to '$username'@'localhost';\r"
14. expect "*Query OK*"
15. puts "数据库 $username 帐号创建成功\n"
16. }
17. "*1 row in set*" {}
18. }
19. }

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调用示例

2. insertDebianUserIfNo $username $password

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以上是带参数的函数，不带参数如下：

proc insertDebianUserIfNo {} {
    ......
}

调用示例

insertDebianUserIfNo

（2）bash 脚本调用并传参

2. ......
3. mysql_default_user=`cat /etc/mysql/debian.cnf|grep user|head -n 1|awk '{print $3}'`
4. mysql_default_pass=`cat /etc/mysql/debian.cnf|grep password|head -n 1|awk '{print $3}'`
5. /usr/local/bin/init_mysql.expect.sh $mysql_default_user $mysql_default_pass

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接受参数的脚本文件 init_mysql.expect.sh 代码片段如下：

2. #!/usr/bin/expect
3. set timeout 6
4. set username [lindex $argv 0] #地一个参数
5. set password [lindex $argv 1] #地二个参数
6. puts "username : $username password : $password\n"
7. ......

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（3）多分支

2. ......
3. send "select User from user where User='$username';\r"
4. expect {
5. "*Empty set*" {
6. puts "数据库 $username 帐号不存在，尝试创建\n"
7. send "create user '$username'@'localhost' identified by '$password';\r"
8. expect "*Query OK*"
9. send "flush privileges;\r"
10. expect "*Query OK*"
11. send "grant ALL PRIVILEGES ON *.* to '$username'@'localhost';\r"
12. expect "*Query OK*"
13. puts "数据库 $username 帐号创建成功\n"
14. }
15. "*1 row in set*" {} #不做处理
16. }

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