Shell Scripting Tutorial for Beginners 1 - Introduction Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development

hello guys welcome to the first video on
bash shell scripting for beginners and
in this video we will learn what is
shell what is bash and what is shell
scripting but before that let's talk
about who can take this you know
tutorial and what are the requirements
of taking this tutorial so what I am
using is I'm using an open to Linux
operating system for this video tutorial
series so if you have any you know Linux
operating system you will be good to go
or if you have you know Mac OS or
Windows 10 also you will be able to
follow along this video tutorial because
Mac OS or Windows 10 nowadays also
supports bash shells okay so for this
video series I will be using the Ubuntu
operating system now if you don't know
how to install open to operating system
or if you don't know how some Linux
commands works I have already made some
videos on Linux commands and how to
install Ubuntu operating system so first
of all see those videos and then you
will be able to follow these videos also
but I'm will be starting from the
beginning so it's not very complex if
you are you know beginning you know from
this video also you will be able to
follow along so first of all what is
shell a UNIX shell program interprets
user commands which are either directly
entered by the user or which can be read
from a file called the shell script or
shell program now it's important to note
here is shell scripts are interpreted
and not compiled so when you write a
shell script it's interpreted by your
operating system and you don't need to
compile your
she'll script in order to execute it so
if you have you know editor you can
write your shell script and you write
awake and execute it without compiling
this shell script right now there are
different types of shells and we will be
learning bash shell scripting okay so
first of all open your terminal and on
open - you can just press control oil T
to open the terminal or go here and
search for the terminal right now in
order to search what are the shell types
which your operating system supports you
just need to write cat and then just
write et Cie and then write shells okay
so cat /et c /l z' and press enter and
you can see these are the different kind
of shells which your system can support
so for example my Ubuntu operating
system support SH - bash and our bash
and this bash is what we are going to
learn right now what is sh sh stands for
bourne shell which is the original shell
still used on unix system or unix-like
environments right so the first shell
which was you know used is this shell
now what is bash so Bash stands for
bourne-again shell
so after this shell this bourne-again
shell was reinvented and it's basically
based upon an improved version of this
as such or Cheban shell and nowadays
it's the standard GNU shell which is
intuitive and flexible okay so it's more
or less the standard shell which is used
in most of the Linux operating system or
you
based operating system including Mac OS
and nowadays Windows 10 also okay so
these are the shell which are supported
by your system now where Bash is located
so to know where Bash is located you
just need to write which bash ok and
then press Enter
and you will be able to see this output
and this is the location where your Bash
is located so now we have all the
information about bash and let's create
of our first hello world bash script so
I'm going to clear the terminal so first
of all what I'm going to do is I'm going
to just navigate to my Desktop folder or
directory and here I'm going to create a
new file which is our shell script file
ok so I'm going to use touch command to
create the file and I'm going to name it
as hello dot as such now in it's
important to know here is dot SH
extension is not necessary to execute
your shell script so if you name it
hello also it will work totally fine but
for us whenever you want to open this
shell script using any editor then it's
you know useful to have this extension
because your editor will be able to
understand that this is a shell script
file so it will give you a beautified
version of this shell script using the
editor ok so it's not necessary but a
good practice to use this extension now
touch command can be used to create a
file so let me just press ENTER which is
going to create this hello dot SH file
you can see here right now let me give
you a little bit more detail about this
files whenever you create a file which
with the touch command and whenever you
do LS - L here and press enter you will
see here your hello dot SH file have the
you know rights here for read and write
for you
and read and write for the group and
read only permission for the user and
this we will see later what this means
and how we can make this script
executable little bit later but let's
start writing some script so let's
create a HelloWorld script with this
shell script so what I am going to use
is a editor called Visual Studio code
but it's not necessary you can open this
shell script using any other editor so
for example on my Ubuntu operating
system I can use G edit to write my
script or as an editor or if you have
them or Nano they will work fine but for
me I like using Visual Studio code as my
editor so I will be using Visual Studio
code but it's not necessary you can use
any other editor for you know writing
script okay so for me I will just give
code and dot this is for opening this
directory using Visual Studio code but
if you don't have Visual Studio code
just double click on your shell script
and will open with the default you know
editor you have okay so my Visual Studio
code is open now and you can see I have
this shell script here and it's empty
right so let's write some you know
script here so the first line of script
whenever you are writing a bash script
its standard practice to use this hash
here so first of all just write hash and
then this bang here and this is called
shebang sometime or hashbang okay and
then write the location of your bash so
we have used a witch bash to know the
location and the location was /bin
forward slash bash right so I will write
this or whatever the location in your
operating system you just need to write
this location here so this has
the interpreter to know that this is a
bash shell script otherwise if you write
here for example other shell for example
as such then your interpreter will know
that it's not bash it saw some other
shells interpreter right so first line
is that and then you can write entering
your you know script so it works same as
a shell so and you can give any shell
script or any a shell command here so
I'm going to use echo and then I will
just write hello world here so hello
world and echo command is used to print
whatever you write in these double
quotes okay so I will just save this and
I'm going to minimize my visual studio
code and now I'm going to execute this
script so I have just write written two
lines here right this first line for the
location and second line is for the echo
echoing hello world right so let's
execute this so I'm going to just write
point or dot and forward slash and the
name of your shell script so just write
the name of your shell script here okay
and then press enter here and now it
says permission denied and this is what
I wanted to you know show you so because
this file whenever you create using
touch it has only read and write
permission but not execute permission
and what we are doing here is trying to
execute this right so we need to change
the permission of this file first and
then execute it so how to change it
using chmod command so just write CH mod
and then just write plus X and then the
name of the file which is hello dot SH
which is going to change the permission
of this file so I'm going to press ENTER
and now just do LS - al once again and
now you can see
that you have read right by the user and
then execute permission by you know by
the group and read and execute
permission by other users so let's try
to execute it again so I'm going to just
execute it and now it gave me hello
world which is what we wanted to execute
or which we wanted to print using our
script so this was the first video on
bash shell scripting I hope you enjoyed
this video in the further videos we will
see some more details about bash shell
scripting so stay tuned
and please read come and subscribe and
bye for now