Shell Scripting Tutorial-59: Communicate with other users using 'write' Video Lecture | Shell Scripting: Discovering to Automate Command-Line Tasks - Back-End Programming

hello guys my name is Martin welcome to
my channel this is the 59th tutorial in
the series of tutorials on UNIX shell
scripting in this video here we are
going to check out a couple of commands
and the first one is right now right is
used to communicate with other users on
the system and there are a couple of
conditions that you must satisfy before
using write command and the first one is
that the recipient user must be logged
in and if the user is in logged in then
an error message will be displayed and
the second condition is that the
recipient user must have enabled message
reception right so if you are a user and
if you do not want to be bothered by
other users you can just disable message
reception and nobody but the super user
will be able to communicate with you
right so that makes sense both
conditions make sense and now let's see
how write works so I have 100 window and
I'll open another one and in one of
these windows I'll log in with the only
other user account I have on my system
and that belongs to the user new user T
and I'll type in the user name first and
then the password and there you go I see
the prompt and in the first terminal
window let me clear the screen with this
one first in the first one window I type
in right that's the name of the command
and then followed up with the space and
then typing the user name of the user
with which I wish to communicate so it's
going to be new user T with this example
and you see the message new user 2 has
message is disabled so you know in the
other window what you would have to do
is you'd have to type in mesg
that can be thought of as a short form
for message and then just type in the
alphabet Y right when you press the
Enter key you don't see any message but
now in this window if you would execute
the write command again then you would
see that the cursor blinks on the next
line and you no longer have the dollar
prompt and in the other window you would
see that a message is displayed that
message from a you know so-and-so user
and you know the terminal ID of the you
know user who's trying to communicate is
this and you know this was a time and
who's the right one was executed right
and in this window I can type in my
message now
Jesus type in a few sentences hey what's
up and I should have send in email
instead right and you would notice that
when I press the Enter key the message
is displayed on the other users turn and
once I'm done typing I just have to
press control D and my prompt will be
returned back to me and in the other
term we would see that you see the
characters AOF which mean end of file
and you know that's the end of the
message basically and in order to get
the prompt back you have to press any
key so I'll press the Enter key and I'll
get my phone back right so right was the
first command that we had to check out
the other command is finger and finger
allows you to see you know the users
with logged in and then you can
obviously do using who but your finger
also tells you which users have given
you the permission to connect to them
and which users have disabled message
reception so if in this window I type in
finger and press the Enter key you would
see the users would logged in and mother
that's myself and then new user to this
log pane and then you would see the
names of the users you know the comment
field in the password file in the EDC
folder that is and then you would see
the terminal IDs and you would also see
the login time right but you know finger
shows and a strict mark against the
users with disabled message reception
but in this case since both the users
are connected to each other and new user
who has enabled message reception you
not seeing in a stroke mark but if in
this window I type in mesg
for the space and then type in the
alphabet N and press the Enter key and
then if in this window clear the screen
first if I execute the finger command
then you would see an asterisk symbol
next to the terminal ID of you know the
user new user - and this star or the
asterisk symbol indicates that the user
new user - has disabled message
reception so you know that's it these
are the two commands I wanted to discuss
in this tutorial I hope you guys had fun
watching thank you so much for watching
this tutorial I see you guys in the next
one please
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