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4DOS is a command line interpreter and programming language for the operating system DOS developed by JP Software in 1989. Emulating the default command prompt shell, COMMAND.COM, 4DOS brought more powerful scripting abilities to DOS environments. It added over two hundred new commands, as well as variable functions, batch file compatibility enhancements, built-in support for debugging scripts and batch files. Later versions of 4DOS supported features beyond those found in MS-DOS and Windows' cmd.exe prompt such as improved wildcard handling, filename completion and directory stack manipulation. With the release of Windows NT systems and declining use of DOS-based operating systems after Windows 95/98/ME, interest in the program decreased but has seen occasional usage by nostalgia hobbyists or businesses requiring older systems.

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