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AUTOEXEC.BAT is a system file that was originally on DOS-type operating systems.It is a plain-text batch file in the root directory of the boot device.The name of the file is an abbreviation of "automatic execution", which describes its function in automatically executing commands on system startup; the filename was coined in response to the 8.3 filename limitations of the FAT file system family.
FC: File compare utility. FDISK: Partitions fixed disks. FIND: Find text in files. FORMAT: Formats disks. JOIN: Joins a drive letter to a subdirectory. LABEL: Set or remove a disk volume label. MEM: Display memory usage. MODE: Set modes for system devices. MORE: Display output one screen at a time. MOVE: Move files from one directory to another.
In MS-DOS, a batch file can be started from the command-line interface by typing its name, followed by any required parameters and pressing the ↵ Enter key. When DOS loads, the file AUTOEXEC.BAT, when present, is automatically executed, so any commands that need to be run to set up the DOS environment may be placed in this file.
Backups of the Windows 95 versions are made as CONFIG.W40 and AUTOEXEC.W40 files. When Caldera DR-DOS 7.02/7.03 is installed on a system already containing Windows 95, Windows' CONFIG.SYS and AUTOEXEC.BAT retain those names. DR-DOS' startup files are installed as DCONFIG.SYS (a name already used in earlier versions of DR DOS) and AUTODOS7.BAT. [5]
Support was discontinued with Windows Me. [1] At the time of its initial release, Sysedit was commonly used to demonstrate multiple document interfaces (MDI). [citation needed] It opens all of the aforementioned configuration files at once in separate daughter windows whenever launched. It still uses the System font from older versions of Windows.
COMMAND.COM is the default command-line interpreter for MS-DOS, Windows 95, Windows 98 and Windows Me.In the case of DOS, it is the default user interface as well. [2] It has an additional role as the usual first program run after boot (init process), hence being responsible for setting up the system by running the AUTOEXEC.BAT configuration file, and being the ancestor of all processes.
Yes by file Yes No No Yes Yes Extension No No ECOFF: Ultrix, Tru64 UNIX, IRIX: none Yes by file Yes No No Yes Yes Yes No No XCOFF: IBM AIX, BeOS, "classic" Mac OS: none Yes by file Yes No No Yes Yes [9] Yes No No SOM: HP-UX, MPE/ix? Unknown Unknown No No Unknown Yes No Unknown No Amiga Hunk: AmigaOS: none No Yes Yes No No Yes No Yes No ...
When a user is logging on to Windows, the startup sound is played, the shell (usually EXPLORER.EXE) is loaded from the [boot] section of the SYSTEM.INI file, and startup items are loaded. In all versions of Windows 9x except ME, it is also possible to load Windows by booting to a DOS prompt and typing "win".