Stream Editor – Loops
Like other programming languages, SED too provides a looping and branching facility to control the flow of execution. In this chapter, we are going to explore more about how to…
Stream Editor – Basic Syntax
This chapter introduces the basic commands that SED supports and their command-line syntax. SED can be invoked in the following two forms: sed [-n] [-e] 'command(s)' files sed [-n] -f…
Stream Editor – Workflow
In this chapter, we will explore how SED exactly works. To become an expert SED user, one needs to know its internals. SED follows a simple workflow: Read, Execute, and…
Stream Editor – Environment
This chapter describes how to set up the SED environment on your GNU/Linux system. Installation Using Package Manager Generally, SED is available by default on most GNU/Linux distributions. Use which command to…
Sed Tutorial
This tutorial takes you through all about Stream EDitor (Sed), one of the most prominent text-processing utilities on GNU/Linux. Similar to many other GNU/Linux utilities, it is stream-oriented and uses…
RSpec – Expectations
When you learn RSpec, you may read a lot about expectations and it can be a bit confusing at first. There are two main details you should keep in mind…
RSpec – Filtering
You may want to read the section on RSpec Metadata before reading this section because, as it turns out, RSpec filtering is based on RSpec Metadata. Imagine that you have…
RSpec – Metadata
RSpec is a flexible and powerful tool. The Metadata functionality in RSpec is no exception. Metadata generally refers to “data about data”. In RSpec, this means data about your describe, context and it blocks.…
RSpec – Helpers
Sometimes your RSpec examples need an easy way to share reusable code. The best way to accomplish this is with Helpers. Helpers are basically regular Ruby methods which you share…
RSpec – Subjects
One of RSpec’s strengths is that it provides many ways to write tests, clean tests. When your tests are short and uncluttered, it becomes easier to focus on the expected…
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