Linux Command Line Tutorial For Beginners 26 - Viewing Resources (du ; df; free command) Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development

hello guys welcome to the next video on
Linux come online tutorial for beginners
in this video I'm going to show you a
bunch of commands which you can use to
view the free resources and use
resources in your Linux operating system
so let's get started the first command
which I'm going to show you is the DF
command and this DF command reports the
amount of available disk space being
used by your filesystem okay so for
example I'm in my home folder right now
and here I just gave this DF command and
now it gives me this kind of output
right so I can see that my root
partition have this much amount of used
memory and this much amount of available
memory but what are these numbers these
numbers doesn't have any units on it and
we cannot you know easily understand
what amount of you know disk space is
being used and what amount of this space
is available so for make it human
readable there is a flag with this
command so just write DF once again and
there is a flag called H here and this
stands for human readable right so when
you give this - H flag with this DF
command and press Enter you will be able
to see the human readable form of the
output so now I can say that 12 GB is
used on my system and 5 GB is available
and all these are other you know root
systems which I'm not you know bothered
about right now right so important is my
this one this final root filesystem
right so let's see the next command now
so I'm going to clear the terminal so
the next command I'm going to show you
is
the D you command and this D you command
is used to estimate and display the disk
space used by files okay for example
right now in I'm in my home folder and I
want to estimate the space used in this
folder called download so I will just go
to the Downloads folder so just right
download CD download and then I can use
this command so just write D u and then
press Enter
so it's going to you know give you all
this output and at the last it's going
to give you the amount of space used by
this folder right now this is also not
very human readable so we can just write
D U and the flag H for zoom the human
readable you know form so just give D u
minus H and then press enter once again
and now I can see that this folder is
using four hundred and sixteen megabytes
of disk space right I can do the same in
my home folder but it has lots and lots
of files so these files has to be you
know it prints these files first and
then gives you the memory disk space
usage here right so in my home folder
there are lots of naso files and i just
want to see this output not all the
output related to files so for that I
can use D you command and then I can use
the S command for summary so this s flag
is for summary and then I can also use
the H for human readable right so d u -
s H and then press Enter
and then it's going to calculate the
memory and in few seconds you are going
to see all the memory used here so you
can see my home directory is using 2.5
GB ok
now you can see these you know warnings
kind of things and it says permission
denied permitted and denied and
permission denied
because it's possible that I don't have
permission to access these files right
so I can use with this command do you -
SH I can use this command with sudo okay
and then I can give my password and now
it's going to give me the direct output
without these warnings okay so this D
you command will help you to estimate
and display the disk space used by files
now the third command which I'm going to
show you is the free command okay and
this free command displays the total
amount of free and used physical and
swap memory in the system as well as the
buffer used by the kernel okay so we can
just use free here and then press ENTER
and then it's going to give you the used
space here and then the free space here
and the cache space which is used by
your kernel right but important in your
case is this line of code which is this
one and this one so this much amount of
you know memory is used by your system
and this is the amount of memory which
is free in your system but this is also
not human readable so there are from
some flags which you can use with this
free command and these flags are for
example - be for bite - k 4 kilobyte - M
4 megabyte - G 4 gigabyte and - Tara 4
terabyte right so - Tara Tara 4 terabyte
so we are going to just see the values
in megabyte first and then we are going
to see the values in gigabytes okay so -
M 4 megabyte with this
space and then when you give this
command now I can see in a more better
way that around 1.1 GB is used at around
0.8 GB is you know free and for example
I can use G flag and now it gives me
this output which is one is used and
zero is you know free because it's not
taking the in consideration the points
decimal points right so it's better to
use the M command for megabyte and you
can read it easily here okay so these
are the some of the command which you
can use to view the memory usage in your
system let's recap these commands once
again so I will clear the terminal first
of all and the first command was DF
command right and this DF command was
used to report the amount of available
disk space being used by your file
system right and you can use minus h4
with it to you know view the human
readable form then the next was the D
you command right so this D you command
will help you to estimate and display
that disk space used by the files right
and this you can use the S flag also to
view the summary right and you can use
even the folder named after these flags
you can for example you want to know the
disk space used by etc' folder you can
even give the folder name here after
these flags and then it's going to give
you the you know disk space used by etc'
folder and for these permission denied
you can use this D you command with sudo
so these warning will not be shown right
then we have seen the free
come on and this free command is going
to display the total amount of free and
used physical and swap memory in the
system right and then we can use some
flags with it for example B for byte and
K 4 kilobyte and 4 mega by G for
gigabyte and tariff or you know terabyte
and you can even use - H for human
readable form ok so once again I can do
this and you can see now it gives these
values and human readable forms and this
is 1 point 1 GB and this is 864
megabytes
ok so in this way you can use the memory
in your system I hope you enjoyed the
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and bye for now