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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

By : Vedran Dakic, Jasmin Redzepagic
4.4 (5)
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Linux Command Line and Shell Scripting Techniques

Linux Command Line and Shell Scripting Techniques

4.4 (5)
By: Vedran Dakic, Jasmin Redzepagic

Overview of this book

Linux Command Line and Shell Scripting Techniques begins by taking you through the basics of the shell and command-line utilities. You’ll start by exploring shell commands for file, directory, service, package, and process management. Next, you’ll learn about networking - network, firewall and DNS client configuration, ssh, scp, rsync, and vsftpd, as well as some network troubleshooting tools. You’ll also focus on using the command line to find and manipulate text content, via commands such as cut, egrep, and sed. As you progress, you'll learn how to use shell scripting. You’ll understand the basics - input and output, along with various programming concepts such as loops, variables, arguments, functions, and arrays. Later, you’ll learn about shell script interaction and troubleshooting, before covering a wide range of examples of complete shell scripts, varying from network and firewall configuration, through to backup and concepts for creating live environments. This includes examples of performing scripted virtual machine installation and administration, LAMP (Linux, Apache, MySQL, PHP) stack provisioning and bulk user creation for testing environments. By the end of this Linux book, you’ll have gained the knowledge and confidence you need to use shell and command-line scripts.
Table of Contents (19 chapters)
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Using a shell script to provision SSH keys

The safest way to deal with passwords is to not use them at all. Using SSH keys is a great way of avoiding passwords completely if we are able to get a public key connected to a user account that the user can log in to without using the password, and since only their private key enables login, this makes the whole transaction much safer.

This recipe deals with just such a task, installing a new machine that is going to serve as a LAMP server and that will enable users to log in using no passwords at all.

Getting ready

In reality, a script such as this will be used if we have a few servers to install and not too much time. An alternative to something like this would be to use a proper orchestration tool such as Ansible, but although it is an enormously powerful tool, Ansible is too complicated for small deployments.

In any case, this script presumes only that our server has a working internet connection to be able to get the...

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