Shell Scripting Tutorial-10: Change File Permissions Using 'chmod' 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 tenth tutorial
in the series of tutorials on shell
programming now in this tutorial the
first command that we're gonna check out
is the chmod command or CH M or D and
this command is basically used to change
file permissions or directory
permissions for a file or directory
respectively what I mean by that is let
me first create a file using touch and
I'll call it test execute LS and see if
it has been created it's right there you
can see it and I'll also execute LS - L
to show you guys the permission for this
file now currently I have default
permissions for this file which means
that the owner can read and write the
file the group of the owner can just
read the file and the other people on
the operating system can also just read
the file now what if I want all people
that is the owner as well as all the
others who are in the same group as the
owners as well as the other people on
the operating system to have all
permissions to this file that is
read/write as well as execute the
command that I used to do that is CH m
or D and I'll type in the numeric value
the net numeric value that I want to
associate with this file so if I want
all three permissions that would mean
that I would have to give seven seven
seven because four is for read to ESPA
right and one is for execute so in total
it would be seven and since there are
three categories of users the owner the
group of the owner and the other users
in the operating system I would have to
type in seven three times and then type
in the name of my file which is test and
when I press Enter let me clear the
screen first and execute LS - L I see
that my file is now being displayed in
green ink instead of black and that's
because it has execute permission
and I also see that now it has read
write and execute permission and not
just for the owner but everyone can
execute or read or write into the file
so that is how you change permissions
now chmod can be used in a variety of
ways but this is the best way in which
you can use it if you want to further
reset it then you know chmod and if
suppose you just want to give read
permission then you can you know just
type in four three times and you know
type in the name of the file test and if
I execute LS - L and I can see here that
now I just have read permission and no
write or execute permissions now what is
the significance of having execute
permission with a diet free if you have
execute permission for a diet tree you
can basically double click and get into
it you can change into the diet tree and
you can you know I mean get into it and
also select files but you obviously
cannot make modifications if you do not
have dried permission so you need to
have write permission to make any sort
of changes but it's absolutely essential
to have execute permission for a diet
tree and if you don't then you basically
cannot do anything with the directory so
that was our discussion on chmod the
next command that we're going to check
out is you name now before talking about
this command I'll just execute it for
you guys and you can see you name with
the - a option and it tells me the name
of my kernel it tells me the name of my
machine it gives me the version of my
kernel and then it tells me the system
date and there's the day in case you
people are finding trouble reading and
that's the year and then it tells me it
gives me some information about the
processor so that is basically what you
name is used for and the - a option is
for all which means the display all
information that you've got about the
system so you name is again
something that you can execute know what
kind of processor you have or you know
the version of your kernel or the
operating system in case you aren't sure
them and that would really happen but
you know sin it's a command and I just
thought that I should you know tell you
guys and maybe we even use it when we
get to our discussion on shell
programming so that's it for now these
are the two commands that I wanted to
discuss in this one and see you guys in
the next tutorial thank you so much for
watching this one and please please
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