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Send message to all the consoles and show connected users

Posted on 2009-05-15
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Last Modified: 2013-12-16
Hello,
I would like to know how many ssh sessions are connected to my Linux and if it is possible also the username used and the ip address.

I would like also to know what is the command that I can run by console, so that this message will be shown to all the other ssh remote consoles.

Thanks
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Question by:ping_it
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6 Comments
 
LVL 8

Accepted Solution

by:
thetmanvn earned 1600 total points
ID: 24393343
1.
root@test:~# who
root     pts/0        2009-05-15 11:35 (192.168.x.x)
root     pts/1        2009-05-15 15:47 (192.168.x.y)

2.

root@test:~# wall
hello
<------------ Press Ctrl+D
Broadcast Message from root@test
        (/dev/pts/1) at 15:51 ...

hello
0
 
LVL 8

Expert Comment

by:thetmanvn
ID: 24393354
More information, you could see who and wall manual.

http://linux.about.com/library/cmd/blcmdl1_who.htm
http://linux.about.com/library/cmd/blcmdl1_wall.htm

Hope this help.
0
 
LVL 30

Assisted Solution

by:Kerem ERSOY
Kerem ERSOY earned 400 total points
ID: 24393416
Hi,

This command will give you the users connected and ssh connections:

lsof -i | grep ^sshd | grep EST | awk '{ print $3, $8 }'

You can broadcast it to all connected usrs with wall as thetmanv suggested like that:

lsof -i | grep ^sshd | grep EST | awk '{ print $3, $8 }' | wall

Cheers,
K.
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LVL 30

Expert Comment

by:Kerem ERSOY
ID: 24393579
BTW who will show all interactive logins including console and telnet and SSH.

Cheers,
K.
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LVL 5

Author Comment

by:ping_it
ID: 24393721
thanks
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LVL 30

Expert Comment

by:Kerem ERSOY
ID: 24393753
You're welcome :)
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