the word file is a word crossing out there ten Kar tei. A file is a structured existence of contentwise matching data, which is put down on a data medium, an external storage medium. These data exist over the running time of a programoutside and become as persistence (English.persistance = preservation) designates.

To table of contents

file systems

files become into thatmost operating systems over file systems administers. The file systems regulate the accesses to mass storages, network drive assemblies and special files.

With most operating systems contents are each normal file first nothing else as a linear lining up of bytes, thus from wholeNumbers in the range of values from 0 to 255. Only the user of a file, thus an application program or the operating system, e.g. interpret this sequence of numbers. as a text, a program or a picture.

The file system administers that beside listings with file names andfile contents still further file attributes described above. To these belong the type of file (listing, normal file, special file), the file size (number of bytes in the file), write one and reader-genuine, date of the production, the last access and the last changeas well as if necessary still different.

In file name usable indications are dependent on file system, operating system and if necessary language options. With UNIX - compatible file systems may in a file name no diagonal stroke “/” and no NUL - indication to stand, furthermore is the length of the file name up255 indications limits. The indications can be differently coded. Newer operating systems support also university code.

logical and physical view

files can be regarded in two different ways: The logical view (see also logical file) sees oneFile as a consequence of data records. In the physical view a file exists of a consequence equal large blocks.

kinds of files

files are as versatile usable as the bytes, of which they consist. After theirOne tries to differentiate between contents, it gives among other things:

possibilities of marking the type of file contain

  • a marking by the file system (z. B. feasibility a flag)
  • a marking in the file name (z. B. .doc at the end of the name)
  • a marking within the data (z. B. <? xml version= " 1,0 " at the beginning)
  • of storage in certain listings (z. B. /usr/share/doc)
  • a resource Fork and other Metainformationen (z. B. with Mac OS)

such a marking is partly mandatorily, partly it serves only the orientation of the user.

symbolic representation

in graphic file managers such as Finder, Explorer or Konqueror usually become files as list or symbols on a paper (window, file and. A.) represented.

word meaning

the word “file” consist of the words “data” and “card index”. (S. Luggage word)

see also

close routine, file header label, editor, file editing menu, file allocation table, Files, file trailer label, linkage of file, file generation, file size, file conversion, file head, file deletion, file name, file organisation, file protection, file memory, file control block, type of file, file management, data file directory,

Web on the left of

comprehensive description ofFile formats:

information to file names:


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