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Computer command in various operating systems From Wikipedia, the free encyclopedia
In computing, ATTRIB is a command in Intel ISIS-II,[1] DOS, IBM OS/2,[2] Microsoft Windows[3] and ReactOS[4] that allows the user to change various characteristics, or "attributes" of a computer file or directory. The command is also available in the EFI shell.[5]
The ReactOS attrib command | |
| Developer(s) | Intel, IBM, Microsoft, DR, Datalight, Novell, Phil Brutsche, ReactOS Contributors |
|---|---|
| Initial release | 1984, 39–40 years ago (DOS version) |
| Operating system | ISIS-II, PC DOS, MS-DOS, MSX-DOS, SISNE plus, OS/2, eComStation, ArcaOS, Windows, DR DOS, ROM-DOS, FreeDOS, ReactOS, SymbOS |
| Platform | Cross-platform |
| Type | Command |
| License | FreeDOS, ReactOS: GPLv2 |
Several operating systems provided a set of modifiable file characteristics that could be accessed and changed through a low-level system call. For example, as of release MS-DOS 4.0, the first six bits of the file attribute byte indicated whether or not a file was read-only (as opposed to writeable), hidden, a system file, a volume label, a subdirectory, or if the file had been "archived" (with the bit being set if the file had changed since the last use of the BACKUP command).[6] However, initial releases of the operating system did not provide user-level method for reading or changing these values.[7]
The initial version of the ATTRIB command for DOS was first included in version 3.0 of PC DOS, with functionality limited to changing the read-only attribute.[7] Subsequent versions allowed the read-only, hidden, system and archive bits to be set.[8] MS-DOS version 3.3 added the capability of recursive searching through subdirectories to display attributes of specified files.[9]
Digital Research DR DOS 6.0[10] and Datalight ROM-DOS[11] also include an implementation of the ATTRIB command.
The FreeDOS version was developed by Phil Brutsche and is licensed under the GPLv2.[12]
Setting the read-only bit of a file provided only partial protection against inadvertent deletion: while commands such as del and erase would respect the attribute, other commands such as DELTREE did not.[13] Changing the system attribute was not possible in early versions of Windows, thus requiring use of ATTRIB.[13] Similarly, a system crash in early versions of Windows could lead to a situation where a temporary file had the read-only bit set and was additionally (and irrevocably) locked by the Windows OS; in this instance, booting into DOS (thus avoiding the Windows lock) and unsetting the read-only attribute with ATTRIB was the recommended way of deleting the file.[14] Manipulating the archive bit allowed users to control which files were backed up using the BACKUP command.[7]
chattr, the equivalent on Unix and Linuxcacls, the Windows NT access control list (ACL) utilitySeamless Wikipedia browsing. On steroids.
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