Shell Scripting Tutorial-14: Convert & Copy Files With 'dd' 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 14th tutorial
in the series of tutorial on UNIX shell
programming now this is going to be a
short tutorial I'm just going to talk
about one command and that is D D now D
D is used for conversion why did I open
my home directory I have to open the
terminal now you should understand what
I mean by conversion
let me first create a text file and I'll
use cat Fred I'll call it test and I'll
just type in a sentence like this is an
ask a text file that's what it is and
I'll save it by pressing ctrl D clear my
terminal and I can show you guys the
output from my test file and this is a
nascar text file that was the only
sentence in it now suppose if I want to
convert all the characters in this text
file from lowercase to uppercase it
would be such a pain in the ass if I
would have to use a text editor for it
what if I just want to do it through the
terminal I can let me first clear the
terminal for you I can use DD for it
I'll type in DD and then I'll type in is
put stands for input file I'll use the
equal to symbol and then I'll specify
the name of my file the one that I wish
to can work and in this case it is test
so I'll type in test and then I'll have
to type in an output file in which the
records will be saved so I'll use oh F
this time
then I press o order for something else
okay and I have to specify a name and
I'll just put out here you can basically
put anything here you know it's it's
going to be a fresh file it's not going
to be same as test in tests we had just
one uppercase character and the rest
were lowercase in the file out we'll
have all uppercase characters in UC and
then I'll use a parameter called convey
which stands for convert and it'll have
to value you case since that's what we
want to do we want to convert or
lowercase letters into uppercase
so you case as the value that we're
gonna assign con and when I press ENTER
DD tells me that it got some records in
and then it copied something 28 bytes of
text and it also tells you the rate at
which it copied text and it also tells
you the time it took which is way less
than a second now I'll clear my terminal
and I'll first show you the test file
you can see that it's intact nothing has
happened to it
but if I show you the output from my out
file then you see that it has all
uppercase characters now this is a you
know just one feature of DD it's it's
used for lured things with DD you can
also format floppy drives and test
drives if you want and you know if you
have an ISO image of an operating system
then you can convert it into you know
you can basically extract all the files
from it and you can copy those files on
a pendrive and then you can install the
operating system through a pendrive
there are a lot of things that you can
do with DD but this is just one
application and this is probably the
application that you'll be using the
most
and the other thing that you can do with
DD is if suppose I wish to convert my
ask I text file to European text file
which is if I want to change the
character encoding using DD the way I
would do it is I'll type in DD and then
I F and I'll put test here and then Oh F
I'll give some other name like test two
maybe
and then convey this time will hold the
value ABCD I see because that is the
European character encoding format and
if I type in sorry press enter then
again nearly tells me the amount of time
it took in the rate at which are
transferred and if I
let me clear the terminal first and if I
show you guys using file the files in my
diet tree then you can see that out the
file that we created using the DD is an
ask I text file so is test but test two
is not NASCAR text file it's non iso
extended ask i text with any airline
terminators which means that it's in the
European format and if you would try to
view it in the terminal then you would
just get non-printable characters and
you know you won't be able to make
anything from the terminal you guys can
try it and yeah that's pretty much it
DD is again as I said it's a command
that can be used for a lot of things but
you know we just discussed a couple of
applications maybe in the coming
tutorials I'll speak about it more but
for now that's all I wanted to tell you
guys so thank you so much for watching
this one and please subscribe to my
channel