Unix/Linux file permissions can be confusing. The basic UNIX permissions come in three flavors;
Owner Permissions : Control your own access to files. Group Permissions : Control access for you and anyone in your group. Other Permissions : Control access for all others.
In Unix, when permissions are configured the server allows you to define different permissions for each of these three categories of users. In a Web server environment permissions are used to control which Web site owners can access which directories and files.
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