Shell Scripting Tutorial-16: Hello World! Video Lecture | Shell Scripting: Discovering to Automate Command-Line Tasks - Back-End Programming

hello guys my name is mother and welcome
to my channel this is the 16th tutorial
in the series of tutorials on UNIX shell
scripting now in the previous tutorials
we've discussed quite a lot of commands
and I haven't kept a count but we've
discussed more than Pony commands for
sure and we have reached a point now
where we can begin our discussion on
shell programming now a shell script is
nothing but a file that has a few
commands in a and the commands are
executed in the same order as they are
specified in the file in this tutorial
we're going to learn to create attack a
script file and then we learn to execute
a script file using the terminal and we
learn a few more things so what I'm
going to do now is I'm going to open my
text editor program and generally when
we create our first program the thing
that we do is we learn to display a
string of text on screen and in UNIX the
way you do that is by using the command
echo now before I type in any text in my
file what I'm going to do is I'm going
to save my file and I'm going to save it
in the home folder and I'll call it s s1
and I'll give it an extension SH now the
extension does not hold any value for
the operating system but it's for me to
know that this file is a script file in
case I later check my directory it will
help me distinguish this file from the
other text files that I have in my
directory so there you go you can be
more elaborate with the names but this
is the convention that we're going to
follow in this course in the second
tutorial if I prepare a script file
coded SS 2 in the next one called SS 3
so that's how we're going to go but you
can basically put any name there so
that's it and when I save this file with
the SH extension my text editor knows
that this is a script file so you know
it would display some of the key words
in my program in different ink and
you see that now what I'm going to do is
I'm going to use the echo command and
within double quotes I put in a message
that I wish to display so I just put in
hello world since that's the thing that
we learn to display and that's it it's
as simple as that I don't have to put a
semicolon at the end I don't have to do
anything my script file is ready and
another thing that we're going to learn
in this tutorial is to use comments in
our script files now you get a comment
in your file by putting the hash
character and then you can type in
anything like this is my first shell
script
and I can save this file now if you wish
to have a comment that spans over
multiple lines then you have to put a
hash at the beginning of each line of
your comment you it's different from
other languages like C or C++ in which
you can put a slash in an asterisk as
the first two characters in your comment
and then you can put a slap and a stroke
in a slash at the end of your commented
it can spread over 15 lines it's you
know it's different here you'll have to
put a hash as the first character in
each line of your comment so that's it
my file is ready and I can see in my
home folder that it's there it's called
SS 1 dot SH and it's looking pretty now
how do you execute a file a script file
that is you have to use the command SH
now SH is a built-in program that is
used by the shell to execute script
files and what you have to do is you
have to type in SH give a space and then
type in the name of the file the program
that you've created and in this case it
is SS 1 dot SH and when I press the
Enter key I get my string of text it's
as simple as that
isn't it very simple so there you go we
learn to create a shell script we also
learn to execute a shell script we learn
how to put comments in our shell scripts
in the next tutorial we're going to
learn how to use other commands in our
shell script and from here on we'll be
increasing the complexity of the course
slightly and I'll try to do that
gradually so that you people you know
stay at par and you guys can also do
research at your own end and learn about
the commands that we've discussed that
is learn more and you can see man pages
of the commands that we've discussed and
you know learn about the options that we
haven't discussed in this course but
come along with the commands and that's
that's you know that's basically the
approach that you should follow and
nobody is a master but you can become
one if you practice and
well was that a quotation it was a bad
one I shouldn't of us at that but it's
okay that's it for this tutorial I see
you guys in the next one thank you so
much for watching and please subscribe
to my channel