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...

1970, the Unix epoch. For example, at midnight on January 1 2010, Unix time was 1262304000. Unix time originated as the system time of Unix operating...

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...

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

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...

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...

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...

(short for manual page) is a form of software documentation found on Unix and Unix-like operating systems. Topics covered include programs, system libraries...

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 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...

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...

mv is a Unix command that moves one or more files or directories from one place to another. If both filenames are on the same filesystem, this results...

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...

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

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...

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...

computing, a Unix domain socket is a Berkeley socket that allows data to be exchanged between two processes executing on the same Unix or Unix-like host...

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...

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

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...

UUCP (Unix-to-Unix Copy) is a suite of computer programs and protocols allowing remote execution of commands and transfer of files, email and netnews between...

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...

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...

character, because file systems on those operating systems keep track of the file size in bytes. Some operating systems, such as Multics, Unix-like systems...

a command in Unix, Plan 9, Inferno, and Unix-like operating systems. The program reads either standard input or a list of computer files and generates...

"Everything is a file" is an approach to interface design in Unix derivatives. While this turn of phrase does not as such figure as a Unix design principle...

(command), a Unix program for determining the type of data contained in a computer file File system, a method of storing and organizing computer files and their...