It’s important to understand permissions if you deal with files and directories on a Linux server. Linux has a file and directory authorization scheme to ensure that only those who are supposed to have access to a directory or file can actually do so. Permissions are set for three categories of users for each file and directory:
The owner or developer of the file or directory is known as the user.A community is a list of users who have been granted permission to use a directory or file in some way.Any else who isn’t the owner, maker, or a member of the correct community is referred to as the “world.” (Think of “world” as a collection of public permissions.)
A three-digit number is the most common way of referring to permissions. When dealing with web applications (scripts), you’ll often be advised to modify the permissions on files and directories to a three-digit amount. Every type of authorization, in this system, is assigned a unique numerical value: Read permissions are 4, Write permissions are 2, and Execute permissions are 1, no permissions at all is 0. These numbers are added together for each kind of user.
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