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It allows mail that is sent to a particular user name to be directed to a different user (or set of users). etc/aliases - Contains user aliases used with e-mail.
INETWORK INFO LINUX PASSWORD
etc/passwd.adjunct - Secures password entries if your system doesn't use shadow passwords. (This file is optional and is usually not used.) etc/gshadow - Contains encrypted passwords associated with groups contained in the /etc/groups file. etc/shadow - Contains encrypted passwords for the users set up in the /etc/passwd file. etc/passwd - Defines the users who have accounts set up on the computer. etc/group - Defines the groups to which users on the computer belong. The following is a list of files that are available for sharing by NIS (not all of them are set up for sharing by default). When the maps have been shared among the computers in the NIS domain, the main result is that all the computers share a common set of users and network configuration. However, NIS slave servers are not used to create the maps. The NIS slave servers contain copies of the NIS maps and can provide that information to client computers when the master is unavailable. Just in case the master server is down or inaccessible, one or more slave servers can be defined. The NIS maps are created on the master NIS server and are accessible to other host computers from that server. With NIS, an administrator creates information databases called maps from common UNIX (or Linux) system files. This domain is a defined set of host computers that may or may not be the same group of computers contained in a TCP/IP domain. The group of computers that the master NIS server supports is referred to as an NIS domain. The information you share with NIS comes from files that are used with UNIX systems and, therefore, compatible with other UNIX-like systems, such as Red Hat Linux. To configure an NIS server, you need the ypserv package installed as well. Some people still refer to NIS as YP, and many of the NIS commands (and even NIS package names) begin with the letters "yp." To use NIS as a client, you need to have the ypbind and yp-tools packages installed. NIS was originally called Yellow Pages, but Sun had to change this name because it was trademarked. Using NIS, computers can share a common set of user accounts, user groups, and TCP/IP host names, as well as other information. Network Information Service (NIS) was created by Sun Microsystems as a way of managing information that is shared among a group of host computers on a network. Understanding Network Information Service