The first version of PC-DOS (later MS-DOS) was little more than a revamped version of QDOS (or DOS-86), the code for which Microsoft bought from Seattle Computing Products (SCP). QDOS, which is an abbreviation for "Quick & Dirty Operating System, was derived (pirated, it has been said) from CP/M, which in turn had been written by Gary Kildall and was distributed by Digital Research. Numerous features, including vaguely Unix-like but rather broken support for subdirectories, I/O redirection, and pipelines, were hacked into Microsoft's 2.0 and subsequent versions; as a result, there are two or more incompatible versions of many system calls, and MS-DOS programmers can never agree on basic things like what character to use as an option switch or whether to be case-sensitive. Not much has changed since then; just look under the hood of Windows '9x/ME and the QDOS and CP/M legacies from elder days stare you in the face.
http://www.euronet.nl/users/frankvw/IhateMS.html
http://www.euronet.nl/users/frankvw/IhateMS.html
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