ĭigital Research DR DOS 6.0 and Datalight ROM-DOS also include an implementation of the ATTRIB command. MS-DOS version 3.3 added the capability of recursive searching through subdirectories to display attributes of specified files. Subsequent versions allowed the read-only, hidden, system and archive bits to be set. 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. However, initial releases of the operating system did not provide user-level method for reading or changing these values. 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). Several operating systems provided a set of modifiable file characteristics that could be accessed and changed through a low-level system call. The command is also available in the EFI shell. In computing, ATTRIB is a command in Intel ISIS-II, DOS, IBM OS/2, Microsoft Windows and ReactOS that allows the user to change various characteristics, or " attributes" of a computer file or directory. ISIS-II, PC DOS, MS-DOS, MSX-DOS, SISNE plus, OS/2, eComStation, ArcaOS, Windows, DR DOS, ROM-DOS, FreeDOS, ReactOS, SymbOS Intel, IBM, Microsoft, DR, Datalight, Novell, Phil Brutsche, ReactOS Contributors
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