AUTOEXEC.BAT
From Academic Kids
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AUTOEXEC.BAT is a batch file run every time the MS-DOS operating system starts, after the CONFIG.SYS file is processed.
In terms of syntax, AUTOEXEC.BAT is just a normal DOS batch file. Typically, an autoexec.bat is configured to set environment variables such as PATH, PROMPT, and BLASTER, and to load drivers (for example mouse and network interface card), MSCDEX.EXE (Microsoft CD-ROM extension), and SMARTDRV.EXE (a disk caching program provided by DOS).
Both CONFIG.SYS and AUTOEXEC.BAT can still be found included in the system files of the later operating system Microsoft Windows. In Windows XP, these files are usually empty files, with no content. However, in earlier versions of Windows, such as Windows 95 and Windows 98, these files often still include commands which are executed when the computer starts up. However, unlike CONFIG.SYS, the batch file isn't required for the DOS boot process.