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MAC times are pieces of file system metadata which record when certain events pertaining to a computer file occurred most recently. The events are usually described as "modification" (the data in the file was modified), "access" (some part of the file was read), and "metadata change" (the file's permissions or ownership were modified), although the acronym is derived from the "mtime", "atime ...
In these systems, the chflags and ls commands can be used to change and display file attributes. To change a "user" attribute on a file in 4.4BSD-derived operating systems, the user must be the owner of the file or the superuser; to change a "system" attribute, the user must be the superuser.
The uses of extended attributes in Be-like systems are varied: For example, Tracker and OpenTracker, the file-managers of BeOS and Haiku respectively, both store the locations of file icons in attributes, [8] Haiku's "Mail" service stores all message content and metadata in extended file attributes, [9] and the MIME types of files are stored in ...
In tag system the information of classification is put inside the file so changing its tag means changing the file and it needs to be saved again and takes time. Metadata tags as described in this article should not be confused with the use of the word "tag" in some software to refer to an automatically generated cross-reference; examples of ...
The ctime timestamp was added in the file system restructuring that occurred with Version 7 Unix, and has always referred to inode change time. It is updated any time file metadata stored in the inode changes, such as file permissions , file ownership , and creation and deletion of hard links .
Information about the data in a file is called metadata. Some of the metadata is maintained by the file system, for example last-modification date (and various other dates depending on the file system), location of the beginning of the file, the size of the file and if the file system backup utility has saved the current version of the files.
XFS is a 64-bit file system [24] and supports a maximum file system size of 8 exbibytes minus one byte (2 63 − 1 bytes), but limitations imposed by the host operating system can decrease this limit. 32-bit Linux systems limit the size of both the file and file system to 16 tebibytes.
gvfsd-metadata is a daemon acting as a write serialiser to the internal gvfs metadata storage. It is autostarted by GIO clients when they make metadata changes. Read operations are done by client-side GIO code directly, and don't require the daemon to be running. The gvfs metadata capabilities are used by the GNOME Files file manager, for example.