Group identifierIn Unix-like systems, multiple users can be put into groups. POSIX and conventional Unixfile 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.
SuperuserIn computing, the superuser is a special user account used for system administration. Depending on the operating system (OS), the actual name of this account might be root, administrator, admin or supervisor. The principle of least privilege recommends that most users and applications run under an ordinary account to perform their work, as a superuser account is capable of making unrestricted, potentially adverse, system-wide changes.
File systemIn computing, a file system or filesystem (FS or fs) governs file organization and access. A local file system is a capability of an operating system that services the applications running on the same computer. A distributed file system is a protocol that provides file access between networked computers. A file system provides a data storageservice that allows applications to share mass storage.POSIXThe Portable Operating System Interface (POSIX; IPA: ) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems.
Unix-likeA Unix-likeoperating system (sometimes referred to as a UN*X,*nix or *NIX) is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Unix-like application is one that behaves like the corresponding Unix command or shell.
InodeAn inode (index node) is a data structure in a Unix-style file system that describes a file-system object such as a file or a directory. Each inode stores the attributes and disk block locations of the object's data. File-system object attributes may include metadata (times of last change, access, modification), as well as owner and permission data. A directory is a list of inodes with their assigned names.Tar (computing)Written inpdtar, star, Plan 9, GNU: COperating systemUnix, Unix-like, Plan 9, Microsoft Windows, IBM iIncluded withWindows 10 version 1803 and latermacOSFreeBSDTypeLossless data compression, file archiverLicenseBSD tar: BSD-2-ClauseGNU tar: GPL-3.0-or-laterpdtar: Public domainPlan 9: MITstar: CDDL-1.0WebsiteBSD tar: libarchive.orgGNU tar: gnu.org/software/tarRepositoryBSD tar: github.com/libarchive/libarchiveGNU tar: savannah.gnu.org/projects/tarstar: codeberg.org/schilytools/schilytoolstar is a file format and a file archiver program.
Unix shellA Unix shell is a shell that provides a command-lineuser interface for a Unix-likeoperating system. A Unix shell provides a command language that can be used either interactively or for writing a shell script. A user typically works within a Unix shell via a terminal emulator; however, direct access via serial hardware connections or a Secure Shell are common for server systems.
UnixUnix ( , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, the development of which started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.Network Information ServiceThe Network Information Service, or NIS (originally called Yellow Pages or YP), is a client–server directory service protocol for distributing system configuration data such as user and host names between computers on a computer network. Sun Microsystems developed the NIS; the technology is licensed to virtually all other Unix vendors.
List of POSIX commandsThis is a list of the shellcommands of the most recent version of the Portable Operating System Interface (POSIX) – IEEE Std 1003.1-2024 which is part of the Single UNIX Specification (SUS). These commands are implemented in many shells on modern Unix, Unix-like and other operating systems. This list does not cover commands for all versions of Unix and Unix-like shells nor other versions of POSIX.
Passwdpasswd is a command on Unix, Plan 9, Inferno, and most Unix-likeoperating systems used to change a user's password. The password entered by the user is run through a key derivation function to create a hashed version of the new password, which is saved. Only the hashed version is stored; the entered password is not saved for security reasons.*As an Amazon Associate I earn from qualifying purchases.