tailieunhanh - SAMS Teach Yourself Unix in 10 Minutes phần 2

UNIX thông qua rõ ràng, súc tích các mô-đun học tập và bước theo các bước hướng dẫn mà không phải lội qua rất nhiều lông tơ và lý thuyết. Bạn sẽ học cách: • Nhận được vào hệ thống và sử dụng dòng lệnh • Di chuyển về hệ thống tập tin • Tạo, di chuyển, đổi tên và xóa các tập tin và thư mục • | 19 Prepare to Log In Now that we have learned a little history and current presence of Unix we should prepare to log in. Before we do however it s important to remember the following To log in to a Unix system you will need to log in with credentials. Credentials are tied to accounts on the system and supplied by a system administrator. For example with a Microsoft Windows desktop operating system such as Windows XP Professional you would log in to the system with the Administrator account and use an assigned password configured by the administrator of that system to gain access. In Unix the logistical setup for logging in is essentially the same. Other things to remember about the Unix login process are as follows In Unix there are different types of accounts. Some are more powerful than others allowing you to do more or less depending on the rights and privileges assigned to them. The root account and generic user accounts are the most common accounts seen on Unix systems. Root is the administrator s user account. It has the most privileges available to the system and can do the most harm as well. Putting too many privileges in the hands of users who do not need them can be dangerous and is strongly discouraged. Try to create individual user accounts so that each user can be tracked by security measures such as auditing and logging. These new accounts would have far fewer privileges and would be able to do far less than the root account. On a related note if you are using Unix at work and have such an account assigned to you think about the ramifications of practicing at work without permission. You can also control access to many user accounts at once by assigning users to groups. Generally related to security groups are categories of users who have access to certain data or have a category of privileges specific to their assigned permissions. Unix is a multiuser platform. This allows for multiple users to log in to the system simultaneously set up their own .