Develop a Linux command line utility

Develop the Linux command line utility-General Linux technology-Linux programming and kernel information. The following is a detailed description. This article describes how to write a Linux command line utility that is simple enough for end users. This article begins with an overview of reliable command line best practices and ends with a detailed study of an effective page selection tool, providing you with the background knowledge required to write your own utility.

This article demonstrates how to compile a Linux command line utility similar to standard commands such as cat, ls, pr, and mv. I selected a utility named selpg, which represents SELect PaGes. Selpg allows you to specify the range of pages extracted from input text, which can come from a file or another process. Selpg is created based on the actual conventions for creating commands in Linux. these conventions include:

Independent work
Work as a component in the command pipeline (by reading standard input or file name parameters, and writing to standard output and standard errors)
Command line options for modifying behaviors

IBM documentation, full text in http://www.ibm.com/developerworks/cn/linux/shell/clutil/