Shell Scripting Tutorial-5: Text Files: Create; Merge & Play 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 fifth tutorial
in the series of tutorials on UNIX shell
programming in this tutorial we're gonna
check out the cat command which is used
to create text files now when I type in
cat at the terminal and type in a file
name let's say I want to create a test
file so I'll just call it test and if I
press ENTER then I'll get an error
message will let me demonstrate it to
you the kind of message that I'll get it
says that cat test no such file or
dietary which means that the shell
search for a file or directory called
test in the home folder and it couldn't
find anything so you know it displayed
this error message to me and that's
because when you create a text file
using cat through the terminal you have
to put a greater than symbol or a
redirection operator between the cat
command and the name of your file if I
now press and enter then you see that my
cursor blinks on the next line and the
shell waits for me to type in some text
and let me just type in a statement like
this is a test file put a full-stop and
if I press ENTER then my cursor goes on
the next line and I can type in as much
as I want and I can use any character
from the keyboard there are no
restrictions and if I want to save my
file and have my daughter prone back
then what I have to do is I have to
press the key combination ctrl D so ctrl
+ D would mean end of document and I
would get my daughter prone back now if
I want to view the contents of the file
that I've just created using the term
node then I'll have to type in cat space
test but this time I'll have to use the
less than symbol or the redirection
operator that tells the shell to take
the input from the file this time and
display it on the screen
if I press an Enter I see my statement
which is this is a test file well please
ignore the barking dog it's not mine
it's the neighbor's dog so there you go
those are the two things that I wanted
to show you guys the other thing is that
you can use cat to
March to files and create you know
create files let me create another file
and call this one random and oops I
forgot to put the greater than symbol
and we if I press and enter this is
random ctrl D I can see what I've just
created now the less than symbol or the
redirection operator for seeing the
contents on the screen is not mandatory
if you do not use it then the shadow
zooms that that is the thing that you
want to use but the greater than symbol
is so don't get confused I would suggest
you guys to make a habit to use the
redirection operator every time you use
the cat command if I type in enter I'll
see my statement now if I want to create
a third file and if I want to merge the
input from the file test and random and
create another file called sample the
procedure for that is cat space random
space test and then I'll put the credit
and symbol and then I'll put the name of
my file which in this case can be
anything I'll put in sample if I press
and enter and see the contents of my
sample file then I see that my first
statement comes from my random file and
the second statement comes from the test
file and the sequence is the same as a
sequence in which I mentioned the files
in my cat statement the one that I've
just executed so there you go there are
few more things that you can do with cat
will be discussing cat in more detail as
we progress in the course but for now
just practice the commands and the
variations that I've discussed and in
the next tutorial we're gonna learn to
rename files and to delete files and
directories using MV and R and
respectively so see you guys in the next
tutorial thank you so much for watching
and please subscribe to my channel