About Unix :
Unix is a general-purpose time-sharing operating system developed in the early 1970s at Bell Laboratories by Ken Thompson and Dennis Ritchie. Almost three decades later, Unix stands as one of the most influential systems in computing history, and its popularity continues to grow. It has been ported to dozens of hardware platforms, and nearly every major vendor supports a product line based on Unix. In 1983, Thompson and Ritchie received the ACM Turing Award ( q.v.) for their contributions to the computing field.
Unix and C Language : -
The UNIX system is itself written in C. In fact C was invented specifically to implement UNIX. All of the UNIX commands which you type, plus the other system facilities such as password checking, lineprinter queues or magnetic tape controllers are written in C.
In the course of the development of UNIX, hundreds of functions were written to give access to various facets of the system. These functions are available to the programmer in libraries. By writing in C and using the UNIX system libraries, very powerful system programs can be created. These libraries are less easy to access using other programming languages. C is therefore the natural language for writing UNIX system programs.
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