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Files and directories are assigned a group, which define the file's group class. Distinct permissions apply to members of the file's group. The owner may be a member of the file's group. Users who are not the owner, nor a member of the group, comprise a file's others class. Distinct permissions apply to others.
Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access. The password file maps textual user names to UIDs.
That is, a system administrator defines a usage or file quota specific to a certain user or group. In some filesystems (e.g. ext4 , XFS , f2fs , ZFS , Lustre ) it is also possible to also define block and inode quota limits for a particular project or directory, by adding a project ID to files that directory tree and defining quota limits for ...
In Unix-like systems, multiple users can be put into groups. POSIX and conventional Unix file system permissions are organized into three classes, user, group, and others.The use of groups allows additional abilities to be delegated in an organized fashion, such as access to disks, printers, and other peripherals.
It was created by Chris Mason in 2007 [15] for use in Linux, and since November 2013, the file system's on-disk format has been declared stable in the Linux kernel. [16] Btrfs is intended to address the lack of pooling, snapshots, integrity checking, data scrubbing, and integral multi-device spanning in Linux file systems. [9]
A filesystem ACL is a data structure (usually a table) containing entries that specify individual user or group rights to specific system objects such as programs, processes, or files. These entries are known as access-control entries (ACEs) in the Microsoft Windows NT, [4] OpenVMS, and Unix-like operating systems such as Linux, macOS, and ...
The Unix and Linux access rights flags setuid and setgid (short for set user identity and set group identity) [1] allow users to run an executable with the file system permissions of the executable's owner or group respectively and to change behaviour in directories. They are often used to allow users on a computer system to run programs with ...
The account creator user right (accountcreator user group) is intended for users involved in the request an account process (ACC), and so have signed the Wikimedia Foundation's confidentiality agreement for nonpublic information. They are not affected by the 6 account creation limit per day per IP, and can create accounts for other users ...