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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 egrep

Using egrep, and regular expressions in general, is something like page one, chapter one stuff from the never-written How to be both cool and incredibly useful IT manual. It is, without a shadow of a doubt, the most useful command that was ever invented in the UNIX/Linux world for system administration. It doesn't really matter whether we're looking for a specific string in a file or set of directories, whether we're trying to find a line in a big text file where a specific string is located, or whether we're trying to find where a specific string isn't, egrep can do all of that for us. We are focusing on egrep specifically, as it supports both concepts that are behind this command – regular expressions and extended regular expressions. That's where we are going to start – first, by explaining the merits of using regular expressions, and then moving on from that to explain why egrep is such an important command. So, buckle up...

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