# vi /etc/pam.d/su
auth sufficient /lib/security/$ISA/pam_wheel.so trust use_uid auth required /lib/security/$ISA/pam_wheel.so use_uid
Debian 的方法更簡單
1. 建立 wheel 的群組 groupadd wheel
2. 編輯 /etc/pam.d/su 把這一段 auth sufficient pam_wheel.so trust uncomma 就行了.
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