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Managing Group Access

Linux groups are a mechanism to manage a collection of computer system users. All Linux users have a user ID and a group ID and a unique numerical identification number called a userid (UID) and a groupid (GID) respectively. Groups can be assigned to logically tie users together for a common security, privilege and access purpose. It is the foundation of Linux security and access. Files and devices may be granted access based on a users ID or group ID. This tutorial attempts to show how this is used.
File, directory and device (special file) permissions are granted based on "user", "group" or "other" (world) identification status. Permission is granted (or denied) for read, write and execute access.


http://www.yolinux.com/TUTORIALS/LinuxTutorialManagingGroups.html

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February 2014
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