2015
Udemy
Andrei Bunghez
1:55
English
This course is meant to help junior software or network engineers, or students to take the first steps into the world of bash shell scripting. It will help you develop your own scripts in order to interact efficiently with command line tools.
The course is structured into two sections. The first section covers basic building blocks that allow you to write your own shell scripts. Here you will learn about basic utilities used throughout the course, a simple script structure, defining functions, using input/output redirection, pipes and command substitution. The last lectures in this section focus on control statements, like if, case, while and for.
In the second section I will show you how to build a simple real-life utility for monitoring the amount of traffic on a network interface. There are two scripts involved in this utility. The "core", that queries system data about a network interface and adds it to a comma-separated-values (csv) file, one line at a time. The other one will take care of scheduling the "core" to be run at specific times, based on a user specified interval. The result is a csv file that contains data collected at specific points in time, data that can be later processed into a spreadsheet application (e.g. build graphs from it).
1 Introduction
Introductory lecture: find out how this course is structured and who is its intended audience.
Section 1: Basic bash Building Blocks
2 Utilities Used in This Section
This lecture briefly describes the utilities used throughout the course and shows you some basic uses.
3 Script Structure
Going over the basic script structure, how to write comments, define and call functions.
4 Variables and the Environment
This lecture shows you how to define and use variables. - Quiz 1
Variables and Expansion - 2 questions
5 Script and Function Parameters
Arguments are the way a script receives data from the outside world. This lecture goes over how you can access parameter values and manipulate them.
6 Input/Output Redirection
This lectures teaches you how to write output to a file, instead of the screen; and how to read input from a file, instead of the keyboard.
7 Pipes
Pipes are a very powerful feature of the shell. This lecture shows you how to use them.
8 Command Substitution
The fun part of using bash begins with command substitution. In this lecture you are going to learn how to replace a command name with its output. - Quiz 2
Recap - 4 questions
9 if
This lecture covers the 'if' statement and the syntax of the associated condition.
10 case
To avoid using multiple if/else if/else statements, use the 'case' statement, that matches an input expression to one of the given patterns.
11 while/until
This lecture covers the while/until loops.
12 for
Both forms of the 'for' loops, C-like and lists, are described in this lecture.
Section 2: The ifMonitor Project - Monitoring a Network Interface
13 Project Goals - Text
This document describes the ifMonitor project goals.
14 The check_iface Script: Extracting the Parameters
This is the first lecture on the check_iface script, the "core" of the ifMonitor project. This first part shows you how to parse the command line parameters of the script.
15 The check_iface Script: Output Data
In this second lecture on the check_iface script, one line of data is written to the output file.
16 cron & crontab
cron & crontab are used to schedule tasks at a specified time.
17 The ifMonitor Script
Using crontab to schedule the check_iface script.
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