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và sử dụng chúng để kiểm soát hành vi của một lệnh mà không sửa đổi lệnh. Ví dụ, bạn có thể sử dụng một biến môi trường để có thông tin lệnh debug in để giao diện điều khiển. Để thiết lập giá trị của một biến môi trường, sử dụng lệnh shell thích hợp để kết hợp một tên biến với một giá trị. Này sửa đổi biến môi trường PATH với giá trị được giao. | Be sure this is the correct key before accepting it. If possible provide users with the encryption key through FTP mail or a download from the web so they can be sure of the identity of the server. If you later see a warning message about a man-in-the-middle attack see below when you try to connect it might be because the key on the remote computer no longer matches the key stored on the local computer. This can happen if you Change your SSH configuration on the local or remote computer Perform a clean installation of the server software on the computer you re attempting to log in to using SSH Start up from a Mac OS X Server disc on the computer you re attempting to log in to using SSH Attempt to use SSH to access a computer that has the same IP address as a computer that you used SSH with on another network To connect again delete the entries corresponding to the remote computer which are stored by name and IP address in the file .ssh known_hosts. An SSH Man-in-the-Middle Attack Sometimes an attacker can access your network and compromise routing information so that packets intended for a remote computer are routed to the attacker who then impersonates the remote computer to the local computer and the local computer to the remote computer. Here s a typical scenario A user connects to the remote computer using SSH. By using spoofing techniques the attacker poses as the remote computer and receives information from the local computer. The attacker then relays the information to the remote computer receives a response and then relays the remote computer s response to the local computer. Throughout the process the attacker is privy to all information that goes back and forth and can modify it. If you see the following message when connecting to the remote computer using SSH it may indicate a man-in-the-middle attack. @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING REMOTE HOST IDENTIFICATION HAS CHANGED @ .
