An operating system is an integral part of any computer. Recently, a variety of Linux variants have been very popular in the OS market due to free distribution and the principle of separation of rights for the user inherited from Unix.
An integral part of any system are files. After all, all user information is stored in them. Access rights to files and folders determine what actions a specific person is allowed to perform, thereby setting access levels and ensuring the security of the entire system. Typically, setting permissions is to enable or disable execution, reading, and writing.
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There are situations when it is necessary to implement a complex scheme of access to information. In this case, the standard rights of the Linux operating system may not be enough. Then you have to resort to the use of access control lists (ACLs). Use this scheme only in very large networks with multilevel access schemes. In other cases, they bypass the standard functions of the operating system.