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In this chapter, we will discuss shell substitution in Unix. What is Substitution? The shell performs substitution when it encounters an expression that contains one or more special characters. Example…

In this chapter, we will discuss shell loop control in Unix. So far you have looked at creating loops and working with loops to accomplish different tasks. Sometimes you need…

In this chapter, we will understand how the vi Editor works in Unix. There are many ways to edit files in Unix. Editing files using the screen-oriented text editor vi is one…

In this chapter, we will discuss Unix / Linux - Shell Loop Types. A loop is a powerful programming tool that enables you to execute a set of commands repeatedly.…

In this chapter, we will understand Unix / Linux - Shell Decision Making. While writing a shell script, there may be a situation when you need to adopt one path…

In this chapter, we will discuss in detail network communication utilities in Unix. When you work in a distributed environment, you need to communicate with remote users and you also…

In this topic, we will discuss Unix / Linux - Shell Basic Operators. There are various operators supported by each shell. We will discuss in detail about Bourne shell (default…

In this chapter, we will discuss in detail process management in Unix. When you execute a program on your Unix system, the system creates a special environment for that program.…

In this chapter, we will discuss in detail pipes and filters in Unix. You can connect two commands so that the output from one program becomes the input of the…

In this chapter, we will discuss how to use Unix / Linux - Using Shell Arrays. A shell variable is capable enough to hold a single value. These variables are…