The Unix file system (UFS) is a family of file systems supported by many Unix and Unix-like operating systems. It is a distant descendant of the original...

The seven standard Unix file types are regular, directory, symbolic link, FIFO special, block special, character special, and socket as defined by POSIX...

Unix operating systems. It has come to be widely used in other computer operating systems, file systems, programming languages, and databases. Unix time...

on Unix-like file systems are defined in the POSIX.1-2017 standard, which uses three scopes or classes known as owner, group, and others. When a file is...

The file command is a standard program of Unix and Unix-like operating systems for recognizing the type of data contained in a computer file. The original...

Unix (/ˈjuːnɪks/ , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T...

first introduced in the Version 7 Unix in January 1979, replacing the tp program (which in turn replaced "tap"). The file structure to store this information...

In Unix and Unix-like computer operating systems, a file descriptor (FD, less frequently fildes) is a process-unique identifier (handle) for a file or...

(abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has...

standard Unix utility that reads files sequentially, writing them to standard output. The name is derived from its function to (con)catenate files (from...

manual page) is a form of software documentation usually found on a Unix or Unix-like operating system. Topics covered include computer programs (including...

In Unix and operating systems inspired by it, the file system is considered a central component of the operating system. It was also one of the first...

In computing, tty is a command in Unix and Unix-like operating systems to print the file name of the terminal connected to standard input. tty stands for...

In Unix-like operating systems, a device file, device node, or special file is an interface to a device driver that appears in a file system as if it were...

utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy files. On Unix, device...

text file with a shebang is used as if it is an executable in a Unix-like operating system, the program loader mechanism parses the rest of the file's initial...

a Unix utility that maintains groups of files as a single archive file. Today, ar is generally used only to create and update static library files that...

A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive...

basic command on Unix and Unix-like operating systems used to remove objects such as computer files, directories and symbolic links from file systems and also...

In computing, cp is a command in various Unix and Unix-like operating systems for copying files and directories. The command has three principal modes...

communication occurs entirely within the operating system kernel. Unix domain sockets may use the file system as their address name space. (Some operating systems...

accepted among different vendors of Unix systems. In 1999, it was chosen as the standard binary file format for Unix and Unix-like systems on x86 processors...

Unix System V (pronounced: "System Five") is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and...

The ln command is a standard Unix command utility used to create a hard link or a symbolic link (symlink) to an existing file or directory. The use of a...

In a computer file system, and primarily used in the Unix and Unix-like operating systems, the root directory is the first or top-most directory in a hierarchy...

The Unix philosophy, originated by Ken Thompson, is a set of cultural norms and philosophical approaches to minimalist, modular software development. It...

tail is a program available on Unix, Unix-like systems, FreeDOS and MSX-DOS used to display the tail end of a text file or piped data. The version of tail...

interpreter to use to execute the file. The shebang must be the first line of the file, and start with "#!". In Unix-like operating systems, the characters...

In Unix-like computer operating systems, a pipeline is a mechanism for inter-process communication using message passing. A pipeline is a set of processes...

usage) is a standard Unix program used to estimate file space usage—space used under a particular directory or files on a file system. A Windows commandline...