Systems programming is a special area of programming on Unix machines. Note that systems programming is not limited to Unix machines: it is just that this book deals with the Unix operating system only. Most commands that have to do with system administration tasks, such as disk formatting, network interface configuration, module loading, and kernel performance tracking, are implemented using the techniques of systems programming. Additionally, the /etc directory, which can be found on all Unix systems, contains plain text files that deal with the configuration of a Unix machine and its services and are also manipulated using systems software.
You can group the various areas of systems software and related system ...
