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Humorous variations of Edgar Allen Poe's The Raven using "Abort, Retry, Ignore?" in place of "nevermore" were written in the 1980s and 1990s and were quite popular, distributed by bulletin board and email. [5]
The version included with MS-DOS 4 and PC DOS 4 is no longer a simple command-line utility, but a full-fledged installer. The command is available in MS-DOS versions 3.3 and 4 and IBM PC DOS releases 3 through 4. [1] This command is no longer included in DOS Version 5 and later, where it has been replaced by SETUP.
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This XOR-encrypted, self-modifying, and deliberately obfuscated x86 assembly code used a variety of undocumented MS-DOS structures and functions to detect if a machine was running DR DOS. The code was present in the installer, in the WIN.COM file used to load Windows, and in several other EXE and COM files within Windows 3.1.
With 4DOS and DR-DOS COMMAND.COM, exit codes (in batchjobs) can be set by EXIT n [6] and (in CONFIG.SYS) through ERROR=n. [6] Exit statuses are often captured by batch programs through IF ERRORLEVEL commands. [4] [6] Multiuser DOS supports a reserved environment variable %ERRORLVL% which gets
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CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems.It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot.