Linux Command Line Tutorial For Beginners 38 - netstat command Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development

hello guys welcome to the next video on
Linux command line tutorial for
beginners and in this video we will
learn how do you next add command in
Linux next add stands for network
statistics and net set is a command line
tool which is used to display network
connection routing tables and a number
of network interfaces and in addition it
can be used to you know new network
protocol State Statistics okay so to
Usenet cells that command we can use the
keyword netstat and you can use two
option with nuts set come on
so the first and the default option
which you can use with nest set is - a
and when you give this method - a it's
going to show you all the you know
connections which are available on your
you know system whether it's a tcp or
UDP or unix connection it's also going
to display you the status if it's
connected all right so listening or it's
established and different kind of
connection states right but when you
give this command and when you scroll
little bit more up you will be able to
see that you know you they have so many
statistics here you can see it has so
many statistics that you you know need
to use some tools to you know view all
these connections at the same time what
we are going to do is we will use this
match sad which is this one with a pipe
called
let okay so that's just give the command
Nats at a and then the single pipe and
then we are going to use the output to
display with the less command okay so
when I press ENTER now you can see
you're giving us the first line of
output which can be you know displayed
on the full terminal and whenever you
want to see more you can just press your
down button and see more you know more
options so this is more flexible right
now
you can see there are the state from our
listening someone connected some are
established you can see the part of this
connection and you can see the type
whether it's UNIX whether it's UDP or
it's TCP connection right and different
state can be established listen or
connected okay now let me clear the
terminal once again to quit this next
set giving left command we already know
that you need to press Q to quit and now
we can use some more options with the
matpat come on so with the net set you
can use T option which stands for TCP so
if you just want to see the TCP
connection then you can use a T right
and then press Enter is just going to
show you the TCP connection you can see
the state on the you know you can see
here the type of connection which is
ppmu okay and once again plus Q to come
out of come on
because we are using left to view this
output right in a similar way if you
want to see the UDP connection then you
use music clip okay and then press Enter
and it's so only going to show you the
UDP connection to you so we will come
come out of the also killing queue now
the next option which we can use with
net that is the L lab and L flag will
allow us to
see the output for the port which are
listening okay
so L stands for listening state so
forgive - L and now you can see whatever
you know programs are listening you can
see the state all listening states are
showing and nothing else right
once again I will quit it now the next
command is for example you want to see
only listening TCP then use LM t for t
CB it's just going to show you the
listening TCP connection and you may
have guessed it correctly that if you
want to see the listening UDP we just
need to write L you okay I'm going to
show you the listing UDP connections
right now the next option which you can
use with your netstat command is the - s
flag and - s flag is for statistics
right so when you give - F it's going to
show you the statistic just enter and
you can see it's showing the statistics
IP total packets received how many
packets are received or how many packets
are going out and you can see which type
of connection it is and then the you
know properties of the packet what are
what is happening so in the UDP 78
packets are received and that each
package - unknown both with key right
and 80 packets are sent right so if you
want to feed a statistics of every
interface then you can use - s once
again I'm going to cut you to quit from
this command and then if you get to
guess it correctly you can use - SP for
TCP right and then if you want to use -
s you for UDP okay
going to show you the zebra connection
and form now if you want to see the PID
of the related interfaces then you can
use the P minus P option okay
so for example you want to see the PID
of all TCP connections which are there
okay
so press Enter and you can see the TCP
connection and then we will be able to
see the PID related but there is no PID
related to because it's state is closed
right so let's quit and let's just give
the P state here okay so just give minus
P and now you will be able to see the
PID and the program name so for example
we have the UNIX connection and here is
the PID of this and the name is daemon
liebe liebe demon okay and also you can
see the pub and the state is connected
here okay
so if you want to see the PID of this
you know program which is using this
connection then you can use the piece
lag okay and obviously if you use II
will show you the TCP and if you do it's
going to show you the nudity and if you
going to if you are going to use X
continue show you the UNIX or
connections okay now if you want to see
the numeric code then you use - M okay -
the N stands for numeric and then I
press ENTER then you can see it's going
to show you the numeric ports which are
used by different you know interfaces on
your system right once again I will cut
quit now - C flag is used to show you
the network statistics continuously so
I'm just removing the left command and
when you use net stat - see it's going
to show you the status continuously you
can see after some time this status is
refreshing right so it's going to show
you the status continuously once again I
am going to the press control-c to quit
from this and yes so - c is for
continuous okay now there are many
options so which you can use with this
method one last important command I want
to show you is the net set I implement
so net that when I saw interface and
East End or extended in the field so e
is for extend and I sent for in the page
right and then you give this command
it's going to show you the same output
which is given by is pancit come on so
when you give is on hey come on it's
going to show you the same output as the
if on click command give okay so if you
want to see what you know connections
you have on your system and what is the
IP address and the broadcast address and
map then you can also use next at ie
if it comes it is not available on your
terminal
okay now some more things I want to show
you here in the last video we have seen
the graph command and this crap is
really helpful whenever for example you
want to use the net set command so we
can use net stat and then we will use a
for all n for numeric and then for
example you want to search for from the
output some line so for example I will
use grab and drag a use to find the sum
right in the last video we have learned
and then in the single course for
example I want to see what are the poles
from the output of Nextag which has the
both a zero in it okay it has this
keyword a zero in it : 8p okay and when
I press ENTER you can see it's showing
the output put this graph is taking the
output from the nets at en come on
and then filtering the line which have
this keyword : a hero okay so you can
combine these command like this also
okay and this pipe means here is that
whatever is the output of the first
command after the spy whatever command
is used is going to be implemented on
the output of the first command okay so
for example if you use left here then
it's going to show you the output of the
net set command using less if you use
graph here then it's going to show you
the output of the net set using crap
okay so this is how you can use net stat
in Linux I hope you and understood the
basic concept of net set and I hope you
enjoyed this video please recommend
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