Linux Command Line Tutorial For Beginners 18 - directory permissions and chmod Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development

hello guys welcome to the next video on
Linux command line to troll for
beginners in the last video I've shown
you how you can change the permissions
of the file using chmod in Linux now in
this video I am going to show you how we
can change the permissions of the
directories in Linux using chmod and
what are the consequences of changing
the directory permissions so let's get
started as you can see here I have a
directory called dir on my desktop so I
will change my directory to desktop
first of all and I will do the long
listing of this directory so here I will
just use L and D because it is a
directory and then the directory name
which is dir right and press Enter and
in here you can see the file permissions
now in the last video as I have shown
you this first letter shows the type of
file or directory so because it's a
directory it's showing D here next three
values here is the permissions of the
user and next three is the permission of
the group and the next three is the
permissions of everyone else right now
let's change the permission of this
directory for the user so that we will
you know reduce the write capability of
the user for example I will just write C
H mod here and then I will do user - W
which means we are you know subtracting
the write permission from the user and
the directory name okay
so just press ENTER and then I will do
the long listing once again and now we
can see the user doesn't have the write
permission so now you can see there's a
lock symbol appears on the directory
right so because it doesn't have the
write permission that's why this lock
symbol appears so let's say we want to
Alice the content of the directory so I
will just do LS
dir for example it shows that this
directory has three files right and
let's say I will just change to the
directory so I will go inside the
directory and I will do LS here and in
here for example I want to create a new
file for example file for so what I will
do is I will just use a touch command
and I will just write file for here so I
want to create a fourth file here and
when I press enter you can see it says
permission denied because we have you
know taken the right permissions from
the user so he cannot create any new
file inside the directory right now for
example I will just go out one step back
one directory back to the desktop and
now I will just once again give the
permissions to the user so write
permission I'm just providing so user
plus W which once again will provide the
write permission to the user and then
this time I want to take the read
permission from the user okay so I have
added the write permission once again
and I want to subtract the read
permission from the user so let's see
what happens when we do this so just
write chmod u minus R which will
subtract the read permission from the
user for the directory and let's do the
long listing here just do this long
listing and you can see the read
permission is taken from the user now
right now I will once again go to the
directory inside the directory for
example so I will do CD dir and we can
go inside the directory but when we do
LS here you see it says permission
Deline so we cannot read the content of
the directory we can go inside the
directory and we know that this
directory contraint contains three files
but because we have taken the read
permissions from
user we cannot read the content of the
directory okay so this is when we change
or when we take the read permissions
from the user so once again I will
provide the read permissions to the user
so chmod u plus R which will once again
give the read permission to the user for
this directory and it says this
directory okay first of all I need to go
to desktop so change directory to the
desktop and then provide this command
okay and once again I will do long
listing of this directory so LS minus LD
directory and now we have the read
permission also for the user now this
time what I want to do is let's take the
execute permissions from the user for
example so I will just do chmod then
user minus X for the directory right and
press enter and once again I will do the
long listing so LS minus LD for the
directory and you can see the execute
permissions from the user is taken right
so now what I will do once again I will
try to go inside the directory which is
dir and it says permission denied right
so I cannot execute anything with this
directory so let's do LS with directory
and press enter and this also gives us
the permission denied right so it shows
the content of the file but access to
this files is not possible right so you
cannot even go inside the directory so
you know you cannot access the content
of the file so for example I will do LS
minus L long listing of the directory
and you can see everywhere it shows the
question mark but it shows all the names
of the file but the permissions it's not
showing because you don't have the
permission to
see even the permissions of the files
inside this directory because we have
taken the execute permissions from this
directory so this is how you can change
the permissions of the directory and
this is how the changing of the
permissions of the directive behaves so
this is the consequences so if you you
know remove the execute permissions you
cannot you know change the files and you
cannot even view the permissions of the
file so I hope you enjoyed this video
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for now