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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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Configuring crond

Having the capability to run jobs on a schedule is very important for everyday system administration. We schedule backups, run cleanup procedures, send reports, do antivirus checks, and do other tasks that business procedures need. Scheduling them means a certain level of automation and getting rid of the manual approach to things, which in turn again gives us more time to focus on more important tasks. Generally speaking, we use either commands or scripts as a way to do these scheduled tasks, and to execute them, we use cron daemon (crond). Let's learn how to use crond to schedule jobs in accordance with our needs.

Getting ready

Keep the cli1 virtual machine powered on and let's create some scheduled jobs via crond.

How to do it…

Let's start by using root to create a cron job. We are going to achieve that by typing in the following command as root:

crontab -e

In Ubuntu, we are going to be asked to select which editor we want...

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