Book Image

PowerShell Core for Linux Administrators Cookbook

By : Prashanth Jayaram, Ram Iyer
Book Image

PowerShell Core for Linux Administrators Cookbook

By: Prashanth Jayaram, Ram Iyer

Overview of this book

PowerShell Core, the open source, cross-platform that is based on the open source, cross-platform .NET Core, is not a shell that came out by accident; it was intentionally created to be versatile and easy to learn at the same time. PowerShell Core enables automation on systems ranging from the Raspberry Pi to the cloud. PowerShell Core for Linux Administrators Cookbook uses simple, real-world examples that teach you how to use PowerShell to effectively administer your environment. As you make your way through the book, you will cover interesting recipes on how PowerShell Core can be used to quickly automate complex, repetitive, and time-consuming tasks. In the concluding chapters, you will learn how to develop scripts to automate tasks that involve systems and enterprise management. By the end of this book, you will have learned about the automation capabilities of PowerShell Core, including remote management using OpenSSH, cross-platform enterprise management, working with Docker containers, and managing SQL databases.
Table of Contents (19 chapters)

Comparing arrays

Array comparison, although fun, can seem to be a little bit of a technical overkill to implement using programming or scripting, the reason being the necessity to loop through the entire arrays and perform comparisons. In PowerShell, though, this task is as simple as passing two arguments to a cmdlet. In Linux, we have the diff tool to help us compare the contents of two files.

Imagine that you had an input file with 30 server names. One of the administrators in the team picked up the list and performed modifications to it by adding and removing a few server names. This list was not source-controlled. Luckily, the administrator did not replace the file, but created a new copy. You would like to review the file before approving the changes made. You want to see which servers were added and which were removed.

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