Bash Scripting on Linux (The Complete Guide) Class 01 - Course Introduction
Summary
TLDRWelcome to the Bash scripting course on Learn Linux TV, where you'll learn to automate repetitive tasks and harness the power of bash, a versatile command interpreter akin to a programming language. Instructor Jay, with over 20 years of Linux experience, guides you through foundational concepts to advanced scripting, covering variables, loops, conditionals, and more. Each episode is available for a comprehensive learning experience, aiming to turn you into a proficient bash scripter.
Takeaways
- 📝 The course is designed to teach everything needed to write bash scripts for Linux administrators and DevOps professionals.
- 🔄 Bash scripting automates the execution of repeated commands, saving time and effort.
- 🛠 Bash offers advanced features like if statements, while loops, and variables, making it almost a programming language.
- 📚 The instructor, Jay, has over two decades of experience with Linux and scripting, and is the owner of Learn Linux TV.
- 📘 Jay has written books, including 'Mastering Ubuntu Server', which can be found at www.ubuntuserverbook.com.
- 🎥 The entire series of videos is available on YouTube for viewers to learn at their own pace.
- 🔢 The course will cover foundational concepts like variables and math functions in bash, which are essential for scripting.
- 🔐 The course will also delve into conditional statements, exit codes, loops, and other scripting constructs.
- 📁 The importance of knowing where to save scripts on the Linux file system will be discussed to ensure easy access and organization.
- 🔁 The course will explore data streams and functions to control data flow and script behavior.
- 🗓️ Scheduling jobs and understanding arguments for scripts will be covered to enhance script utility and flexibility.
Q & A
What is the main purpose of writing bash scripts according to the video?
-The main purpose of writing bash scripts is to automate the execution of a series of commands that are run repeatedly, thus saving time and effort for Linux administrators or DevOps professionals.
Why might someone consider bash scripting similar to a programming language?
-Bash scripting might be considered similar to a programming language because it offers features like if statements, while loops, and the ability to use variables, which are common in programming languages.
What does the instructor claim about the episodes of the bash scripting course?
-The instructor claims that every single episode of the bash scripting course is already uploaded on YouTube, allowing viewers to watch them all at once or take their time learning the concepts.
What is Jay's professional background, and how does it relate to the course?
-Jay is the owner of Learn Linux TV, an education company specializing in Linux. He has over two decades of experience with Linux and has held various positions in system administration, network administration, DevOps management, and other roles. His extensive background in Linux makes him well-suited to teach the course.
What is the significance of the 'hello world' script in the context of the course?
-The 'hello world' script is significant as it is traditionally the first example taught in programming and scripting languages, and the course follows this tradition by starting with it.
Why are variables covered early in the course?
-Variables are covered early in the course because they are a foundational concept in scripting, and they will be used in many of the lessons throughout the course.
What is the role of exit codes in bash scripting?
-Exit codes in bash scripting indicate whether a command or script was successful. They help administrators understand the result of a script and take appropriate action based on that result.
What is the purpose of while loops in the course?
-While loops are used in the course to teach how to write scripts that monitor for a file or other criteria to decide whether the script should continue running or exit, providing control over script execution.
What does the update script example in the course demonstrate?
-The update script example demonstrates how to keep servers up to date and serves as a recurring example in several videos throughout the course.
What is the focus of the class on scheduling jobs?
-The focus of the class on scheduling jobs is to teach how to schedule tasks to run at specific times or under certain conditions, which is a two-part class in the course.
What additional resources does the instructor offer for further learning?
-The instructor offers his latest book, 'Mastering Ubuntu Server', as an additional resource for further learning, which can be found at www.ubuntuserverbook.com or by searching for the book on Amazon.
What are the technical requirements to follow along with the course?
-The technical requirements to follow along with the course include having a computer with a terminal and access to a Linux server or a Linux installation, which can be a virtual machine, a spare server, or even a personal computer running Linux.
Outlines
📚 Introduction to Bash Scripting Course
In this introductory paragraph, the speaker welcomes viewers to the Learn Linux TV course on Bash scripting. The purpose of the course is to teach the essentials of writing Bash scripts, which are useful for automating repetitive command sequences in Linux administration and DevOps roles. The speaker emphasizes the efficiency of scripting over manual command execution and introduces the concept of Bash as a programming language with features like if statements and loops. The course content is outlined, promising to take viewers from basics to advanced scripting, with all episodes available for immediate viewing. The speaker also introduces himself as Jay, an experienced Linux professional and owner of Learn Linux TV, and mentions his book 'Mastering Ubuntu Server'.
🔍 Course Content and Prerequisites
This paragraph delves into the specifics of the course content, starting with the creation of a 'Hello, World' script, a traditional first step in programming and scripting education. The course will cover foundational topics like variables, math functions, and control structures such as if statements and loops. It will also explore exit codes, data streams, functions, and case statements, leading up to creating a practical backup script. The speaker outlines the lessons, emphasizing the importance of understanding where to save scripts and how to pass arguments to them. The course concludes with a look at job scheduling and资源整合. The paragraph concludes with the prerequisites for the course, which include a computer with terminal access and a Linux installation, suggesting that viewers can use the channel's resources to set up Linux if needed.
🚀 Getting Started with Bash Scripting
The final paragraph serves as a call to action, encouraging viewers to begin their journey in learning Bash scripting. The speaker reiterates the availability of all course videos for immediate viewing and invites viewers to proceed to the next episode. The paragraph wraps up with a thank you note to the viewers and an expression of enthusiasm for teaching the upcoming lessons. The speaker also hints at the wealth of Linux-related content available on the channel, positioning it as a valuable resource for those new to Linux or needing assistance with installation.
Mindmap
Keywords
💡Bash
💡Scripting
💡Automation
💡Linux Administrator
💡DevOps
💡Variables
💡If Statements
💡Loops
💡Exit Codes
💡Functions
💡Scheduling Jobs
💡Arguments
💡Backup Script
Highlights
Introduction to a new bash scripting course aimed at teaching everything needed to write bash scripts.
Rationale for writing bash scripts: automating repetitive command execution for efficiency.
Bash scripting's capabilities beyond simple command execution, including conditionals and loops.
Bash's role as a command interpreter or shell with programming language-like features.
Course structure includes an overview and subsequent deep dives into specific bash scripting topics.
Availability of the entire course series on YouTube for self-paced or binge-watching learning.
Instructor Jay's introduction, sharing his extensive experience with Linux and scripting.
Jay's professional background in system administration, network administration, and devops management.
Jay's passion for creating educational content and his latest book 'Mastering Ubuntu Server'.
Course outline detailing the topics covered in each class, starting with a 'Hello, World' script.
Importance of understanding variables as a foundational concept in scripting.
Exploration of math functions in bash and their unique handling compared to other languages.
Introduction to if statements and branching in scripts for decision-making capabilities.
Understanding exit codes as indicators of script or command success.
Utilization of while loops for scripts that monitor conditions to determine execution flow.
Creating an update script as a recurring example to demonstrate scripting concepts.
For loops as a tool for iterating over sequences in bash scripts.
Discussion on where to save scripts in the Linux filesystem for easy access and organization.
Data streams' role in controlling the flow of data within scripts.
Functions in bash scripting for modular and reusable code segments.
Case statements for creating user-selectable menus within scripts.
Scheduling jobs as a two-part class on automating script execution at specified times.
Using arguments to pass information to scripts for dynamic execution.
Creating a comprehensive backup script integrating various course concepts.
Course conclusion with additional resources for further learning and script development.
Prerequisites for the course, including a computer with terminal access and a Linux installation.
Recommendation to use the instructor's YouTube channel for additional Linux installation guidance.
Transcripts
thank you
hello and welcome back to learn Linux TV
and also welcome to my brand new bash
scripting course in this series what I'm
going to do is teach you everything that
you need to know in order to get up and
running when it comes to writing bash
scripts but you might be thinking why
exactly would I want to write a bash
script
well we as Linux administrators or
devops professionals are going to be
running quite a few commands and
eventually we're going to run into a
situation where we have a series of
commands that we need to run every now
and then but if we're going to be
running the same set of commands over
and over again then why not automate it
why would we want to manually run those
commands every time we go to complete
that task
and that's where bash scripting comes in
at its lowest form bash scripting is
just a way to have a bunch of commands
run one after another commands that you
save in a text file and then execute as
a script but that's not all that you
could do in bash bash has all kinds of
cool features such as if statements
while Loops the ability to have
variables and if I didn't know any
better I would say based on that
description it almost sounds like bash
is a programming language well if you're
thinking about bash in terms of a
programming language you're not actually
far off now to be fair bash is actually
a command interpreter or a shell that we
use on our Linux or Unix systems but
don't let the term interpreter fool you
bash is basically a programming language
and the scripts that you could write
within bash are really awesome and
you're going to see examples of that in
this series so what I'm going to do in
this video is introduce the course and
tell you all about it and then in each
video from here on out we're going to
learn more and more about bash scripting
and by the end of this series you're
going to be a pro when it comes to
writing bash scripts and I can't wait to
teach you guys about bash scripting this
is going to be a ton of fun in fact
every single episode in this series is
already on YouTube right now that's
right every single episode has been
uploaded at the exact same time if you
want to binge watch this series you can
go right ahead and do so but then again
it might be better to slow it down a bit
and take your time and make sure that
you're learning all of the concepts
either way every video in this series is
going to be right there waiting for you
whenever you're ready for it anyway like
I mentioned earlier in this video what
I'm going to do is introduce the course
so let's go ahead and switch gears and
I'll give you an overview of what you'll
expect to find in this course
[Music]
so at this point I'll tell you guys a
little bit more about myself
first of all my name is Jay nice to meet
you
now I've been working with Linux for
over two decades it's literally my
favorite technology and writing scripts
has definitely helped me along my career
and I'm sure it'll help you and yours as
well
now professionally I am the owner of
learn Linux TV an education company that
specializes in Linux
before learn Linux TV became my only gig
I've held positions in system
administration Network Administration
devops Management and other roles as
well I Love Leading people leading teams
and I also love technology so my career
has been very good to me in addition to
creating educational videos I also write
books as well my latest book as of the
time I'm recording the series is
mastering Ubuntu Server if you want to
check it out you could go to
www.ubuntuserverbook.com and that domain
will actually take you to whatever the
current version of that book happens to
be at any one time now before you
actually visit that domain I want to
point out that what it'll do is take you
to the United States store for the book
on Amazon and if you live in a different
country then what you'll want to do
instead is go to amazon.com and search
for mastering Ubuntu Server you can do
that on your version of Amazon for your
country and once you do that you should
be able to order the book from an Amazon
site that is closer to your geographic
location anyway I love Linux it's my
favorite technology and I love creating
educational content around Linux so you
know what I couldn't possibly be in a
better place when it comes to my career
because I'm doing what I love I love
teaching I love technology okay so it
all works out
now let's go ahead and take a look at
the outline for this course
the first class will serve as the
introduction and welcome and I would
love to tell you what we're going to do
in that class but we're already doing it
you are actually watching that video
right now
in the next video what we're going to do
is write our very first bash script and
specifically we will create a hello
world script and that's because in well
pretty much any programming language as
well as scripting languages the hello
world example is usually the first thing
that instructors teach you and I am not
going to break that tradition in the
series
in class number three we are going to
explore variables variables allow us to
well save information for later
in addition we could use variables to
make our scripts change depending on
what variables equal and the reason why
we're going to cover variables early in
this course is because it's a very
important foundational concept we will
be using variables in quite a few of the
lessons so it's a good idea to get that
out of the way early in the course class
number four we're going to take a look
at math functions for example how do you
add subtract or multiply numbers in bash
now you might already be familiar with
how to perform math functions in a
programming language perhaps another
scripting language however math
functions are actually a bit different
in bash so we definitely want to make
sure that we take a look at that
continuing in class number five we're
going to take a look at if statements
and that'll also be our first look at
branching basically we can have a script
that does something different depending
on some other criteria a test case if
you will and that allows us to make
decisions within scripts and that's
definitely an important aspect to cover
and continuing on from there in class
number six what we'll do is take a look
at Exit codes
every command and every script is going
to have an exit code and that helps you
as the administrator understand if a
script or command was successful and
knowing that will help you take action
based on the result
class number seven is all about while
loops and that helps us write scripts
that are watching for a file or some
other criteria to understand whether or
not that script should be running or if
it should exit we have full control over
that so that's what we'll explore in
class number seven
in class number eight we're going to
take a little break from branching and
take our first look at an update script
and that particular script is going to
serve as an example in several videos
going forward so that's the first time
that we'll take a look at that and that
update script will help us keep our
servers up to date
in class number nine we will return to
branching this time taking a look at for
Loops in class number 10 we will answer
the question where should I save my
scripts and the reason that question
even comes up is because there's quite a
few directories in the Linux file system
and although we don't need to understand
the purpose of every directory on the
Linux file system it is important to
understand which directories actually
pertain to scripts and that'll help us
answer where we should save our scripts
for later use
continuing into class number 11 we'll
take a look at data streams basically
standard input standard output as well
as standard error data streams
themselves allow us to control the flow
of data in our scripts and that gives us
even more options
in class 12 we'll take a look at
functions and that one's going to be a
lot of fun
class number 13 is all about case
statements and this essentially allows
us to create a menu from which the user
can actually select an option and then
the script responds accordingly
in class number 14 we take our first
look at scheduling jobs so this class is
part one of a two-part class that goes
over exactly that
in class 15 we continue our look at
scheduling jobs
in 16 we'll take a look at arguments
specifically how to pass arguments to a
script and in class number 17 that's
where a majority of what we've learned
in this course will all come together
because we will use quite a few of the
concepts when we create a backup script
and that backup script is going to be
something that you can actually use to
back up your servers and after we do
that class number 18 is going to be our
closing that's where we'll wrap
everything up and I will also give you
some additional resources that you can
use to extend your knowledge even
further
foreign
to get started and I hope you are we're
going to have a lot of fun but you might
be wondering what exactly do I need in
order to follow along with this course
well the first thing you're going to
need is a computer obviously you can't
really write bash scripts on a toaster
actually I probably need to walk that
statement back considering that iot
devices often run Linux and they
probably run scripts too so if you have
an iot toaster well it could probably
run bash scripts but in this course what
we're going to do is just use a computer
and you'll also need a terminal as well
in Windows it's built in in Mac OS it's
built in and also on Linux distributions
it's built in so regardless of what kind
of computer that you have you should be
in good shape in addition to that what
you'll need is a Linux server or some
kind of Linux installation that you
could log into so what you can do for
that is spin up Linux in a virtual
machine maybe a spare server or maybe
even your desktop or laptop if that
already runs Linux then well you have
everything you need but that's about it
if you have a computer and you have the
ability to to spin up a Linux
installation you should be good to go
but if you don't actually have a Linux
installation all set up and you have no
idea how to get one set up do I have the
YouTube channel for you in fact you're
watching it right now the last time I
checked there was almost a thousand
videos on this channel and I'm probably
over that at this time so there's going
to be no shortage of content on this
channel that you can use to get up and
running with Linux in fact you can check
out any of the videos that I already
have that tell you how to install Linux
and you should be good to go anyway I
can't wait to get started and teach you
guys bash scripting this course is going
to be a ton of fun so this is the end of
this particular video right here but
like I mentioned earlier every video in
this series is already on this channel
so you can watch the next episode
anytime you'd like to do so in fact why
don't you go ahead and meet me there
right now in the meantime thank you guys
for watching this particular video and
I'll see you in the next video
[Music]
thank you
[Music]
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