The seven standard Unix file types are regular, directory, symbolic link, FIFO special, block special, character special, and socket as defined by POSIX.[1] Different OS-specific implementations allow more types than what POSIX requires (e.g. Solaris doors). A file's type can be identified by the ls -l command, which displays the type in the first character of the file-system permissions field.
For regular files, Unix does not impose or provide any internal file structure; therefore, their structure and interpretation is entirely dependent on the software using them.[2] However, the file command can usually be used to determine what type of data they contain.[3]
^"<sys/stat.h>". The Open Group Base Specifications Issue 6. The Open Group. 21 July 2019.
^Loukides, Mike (October 2002). "When Is a File Not a File?". Unix Power Tools (3 ed.). O'Reilly. p. 80. ISBN 9780596003302. A file is nothing more than a stream of bytes ...
^"file". IEEE Std 1003.1-2017 (POSIX). The Open Group. 2018.
The seven standard Unixfiletypes are regular, directory, symbolic link, FIFO special, block special, character special, and socket as defined by POSIX...
OSTypes Uniform type identifier Unixfiletypes Windows filetypes For a list of filename extensions, see list of file formats list of filename extensions...
command to list computer files and directories in Unix and Unix-like operating systems. It is specified by POSIX and the Single UNIX Specification. It is...
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...
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...
system. It is also referred to by its address family AF_UNIX. Valid socket types in the UNIX domain are: SOCK_STREAM (compare to TCP) – for a stream-oriented...
Unix operating systems. It has come to be widely used in other computer operating systems, file systems, programming languages, and databases. Unix time...
OS/macOS and Unix filesystems, so that applications can access files on local file systems of those types without having to know what type of file system they...
interrupted transfers, directory listings, and remote file removal. There is also support for all UNIXfiletypes, including symbolic links. SFTP attempts to be...
"Everything is a file" is an idea that Unix, and its derivatives, handle input/output to and from resources such as documents, hard-drives, modems, keyboards...
(command), a Unix program for determining the type of data contained in a computer fileFile system, a method of storing and organizing computer files and their...
AT&T Unix version 1, along with the chmod system call. As systems grew in number and types of users, access-control lists were added to many file systems...
file. On modern operating systems such as Microsoft Windows and Unix-like systems, text files do not contain any special EOF character, because file systems...
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