我正在从shell脚本自动化二进制安装。二进制文件询问4个问题，如：
combo.currentIndexChanged.connect(
lambda ix, p=position: self.logChange(comboList['combo{0}'.format(p)]))
我正在尝试的是：
Do you want to configure proxy settings (yes/no)? yes
Examples:
http://squid.mycompany.com:3128
https://username:password@squid.mycompany.com:443
proxy url: http://proxy.abc.company.net:8080
These are your proxy settings:
protocol: "http"
host: "proxy.abc.company.net"
port: "8080"
Are these correct? (yes/no) yes
We recommend using NTPD to keep the time in sync.
Do you want to install and configure this now (yes/no)? no
但我收到的错误是：
echo -e "yes\n'"'$PROXY_URL'"'\nyes\nno\n" | bash installer-new-kvm-debian.sh
知道我在做什么或者有什么其他方法可以实现同样的目标吗？