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File attribute
File attributes are a type of metadata that describe and may modify how files and/or directories in a filesystem behave. Typical file attributes may, for example, indicate or specify whether a file is visible, modifiable, compressed, or encrypted. The availability of most file attributes depends on support by the underlying filesystem (such as FAT, NTFS, ext4) where attribute data must be stored along with other control structures. Each attribute can have one of two states: set and cleared. Attributes are considered distinct from other metadata, such as dates and times, filename extensions or file system permissions. In addition to files, folders, volumes and other file system objects may have attributes.
Traditionally, in DOS and Microsoft Windows, files and folders accepted four attributes:
As new versions of Windows came out, Microsoft has added to the inventory of available attributes on the NTFS file system, including but not limited to:
Other attributes that are displayed in the "Attributes" column of Windows Explorer include:
In DOS, OS/2 and Windows, the attrib command in cmd.exe and command.com can be used to change and display the four traditional file attributes. File Explorer in Windows can show the seven mentioned attributes but cannot set or clear the System attribute. Windows PowerShell, which has become a component of Windows 7 and later, features two commands that can read and write attributes: Get-ItemProperty and Set-ItemProperty. To change an attribute on a file on Windows NT, the user must have appropriate file system permissions known as Write Attributes and Write Extended Attributes.
In Unix and Unix-like systems, including POSIX-conforming systems, each file has a 'mode' containing 9 bit flags controlling read, write and execute permission for each of the file's owner, group and all other users (see File-system permissions §Traditional Unix permissions for more details) plus the setuid and setgid bit flags and a 'sticky' bit flag. The mode also specifies the file type (regular file, directory, or some other special kind).
In 4.4BSD and 4.4BSD-Lite, files and directories (folders) accepted four attributes that could be set by the owner of the file or the superuser (the "User" attributes) and two attributes that could only be set by the superuser (the "System" attributes):
FreeBSD added some additional attributes, also supported by DragonFly BSD:
Hub AI
File attribute AI simulator
(@File attribute_simulator)
File attribute
File attributes are a type of metadata that describe and may modify how files and/or directories in a filesystem behave. Typical file attributes may, for example, indicate or specify whether a file is visible, modifiable, compressed, or encrypted. The availability of most file attributes depends on support by the underlying filesystem (such as FAT, NTFS, ext4) where attribute data must be stored along with other control structures. Each attribute can have one of two states: set and cleared. Attributes are considered distinct from other metadata, such as dates and times, filename extensions or file system permissions. In addition to files, folders, volumes and other file system objects may have attributes.
Traditionally, in DOS and Microsoft Windows, files and folders accepted four attributes:
As new versions of Windows came out, Microsoft has added to the inventory of available attributes on the NTFS file system, including but not limited to:
Other attributes that are displayed in the "Attributes" column of Windows Explorer include:
In DOS, OS/2 and Windows, the attrib command in cmd.exe and command.com can be used to change and display the four traditional file attributes. File Explorer in Windows can show the seven mentioned attributes but cannot set or clear the System attribute. Windows PowerShell, which has become a component of Windows 7 and later, features two commands that can read and write attributes: Get-ItemProperty and Set-ItemProperty. To change an attribute on a file on Windows NT, the user must have appropriate file system permissions known as Write Attributes and Write Extended Attributes.
In Unix and Unix-like systems, including POSIX-conforming systems, each file has a 'mode' containing 9 bit flags controlling read, write and execute permission for each of the file's owner, group and all other users (see File-system permissions §Traditional Unix permissions for more details) plus the setuid and setgid bit flags and a 'sticky' bit flag. The mode also specifies the file type (regular file, directory, or some other special kind).
In 4.4BSD and 4.4BSD-Lite, files and directories (folders) accepted four attributes that could be set by the owner of the file or the superuser (the "User" attributes) and two attributes that could only be set by the superuser (the "System" attributes):
FreeBSD added some additional attributes, also supported by DragonFly BSD: