Edit and run before worry

I have been learning The C Programming Language by Kernighan and Ritchie since this May.

I studied C, the programming language at numerical calculation class of university and have already know basic syntax of it and how to compile.

However, I know little about how the language have deeper access to particular hardware architecture. Neither had I known more than a little about how it was used to program UNIX and UNIX-like operation systems such as Linux.

Just recently, I have had a desire to know deeply about how Linux and other UNIX-like os which can run on the hardware I have, and learning deeply about the language from the basic is the essential part to achieve this.

Reading the first tens of pages, I thought that I had already known most of things written on these pages. However I realized that I haven't been familiar enough with it. Advancing to next pages anyway can be a good idea, but finally I decided, "Why don't I try inputting the sample codes, compiling them, and execute it, since I have had a C compiler at hand and accessible enough."

This is why I'm compiling and executing first sample codes of classics of the most using programming language now.

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