NIS for Managing Users
One of the most popular ways to manage user-related information in a distributed environment is the Network Information System (NIS). NIS provides a method for multiple systems to share a centralized database of password, group, and other optional databases such as services and/or hosts. By doing so, the administration of user accounts is simplified for both end-users and system administrators. You will also often hear NIS referred to as "Yellow Pages" or "YP"; in fact, most of the NIS commands begin with the letters "yp".
NIS and other such technologies are required only in a distributed environment where users have to be managed on many systems. This is because changes in information, such as adding and removing users, ...
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