This tutorial at IBM's developerWorks website gives you good background to start writing Linux command-line utilities. It covers solid command-line best practices and also includes a comprehensive tour of a working page-selection tool. It is modeled on de facto conventions for creating commands in Linux, including: working standalone, working as a component in a pipeline of commands (by reading either… standard input or a filename argument, and writing to standard output and standard error), and taking command line options that modify its behavior.

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