expect无交互切入root后 怎么执行docker system prune？当前提示报错！

Question

有dockerqingli.sh 文件内容如下：

#!/usr/bin/expect
spawn su root
expect "*password:*"
expect "*密码*"
send "9@Lxc\r"
#expect "登陆成功"
expect eof
expect "]*"
send "docker system prune\r"
expect "*[y/N]*"
send "y\r"
interact

docker system prune直接执行时的结果

[root@localhost lxc347]# docker system prune
WARNING! This will remove:
  - all stopped containers
  - all networks not used by at least one container
  - all dangling images
  - all dangling build cache
Are you sure you want to continue? [y/N] 

expect dockerqingli.sh运行提示错误：

[li@localhost lxc347]$ expect dockerqingli.sh
spawn su root
密码：
[root@localhost lxc347]# invalid command name "y/N"
    while executing
"y/N"
    invoked from within
"expect "*[y/N]*""
    (file "dockerqingli.sh" line 14)
[li@localhost lxc347]$ 

dockerqingli.sh 怎么修正文件内容呢？

Answer 1

经过调试，将dockerqingli.sh内容修改如下，即可实现交互进入root用户，切换目录，执行docker system prune，然后进入指定目录实现sh deploy.sh等操作，如果有多个sh需要执行，可参照下列代码进行添加与完善。

#!/usr/bin/expect
#开始交互进入root用户与输入密码
spawn su root
expect "*password:*"
expect "*密码*"
send "942971@Lxc\r"
#屏显输出空行
send_user "\n\n"
#屏显输出登录成功
send_user "登陆成功"
send_user "\n\n" 
send_user "开始清理docker空余镜像"
#判断]结尾
expect "]*"
#输入命令并回车执行
send "docker system prune\r"
#判断是否有y/n
expect "y/N"
#输入y并回车确认
send "y\r"
send_user "\n\n"
send_user "清理docker空余镜像完毕"
send_user "\n\n"
expect "]*"
#进入制定目录
send "cd /home/lixiaochun/lxc347/\r"
expect "]*"
send "ls\r"
expect "]*"
send "cd /home/lixiaochun/lxc347/boot/\r"
expect "]*"
send "sh deploy.sh\r"
expect "]*"
send_user "全部执行完毕！！"
#等待用户交互
interact