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disconnecting users

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metrix007

metrix007

Technical User
Dec 26, 2001
48
AU
hi all, say i see a user connected, not logged in, just connected, and i want to disconnect them, how would i do this? and not connected with ftp or anything, not to a running service, just 'connected', sort of like an ipc connection in windows. is there a tool to disconnect connections?
 
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If they're not logged in then they maybe just at the login prompt - in which case login will timeout soon, and you can just ignore them. Mike
michael.j.lacey@ntlworld.com
Email welcome if you're in a hurry or something -- but post in tek-tips as well please, and I will post my reply here as well.
 
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I think you mean a network connection such as would be shown by "netstat -a"?

To disconnect it use lsof to determine the PID of whatever it is that you don't like and kill that process.
Tony Lawrence
SCO Unix/Linux Resources tony@pcunix.com
 
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The answer I gave above about "lsof" does depend upon your having "lsof" available. It is available for many, but not all Unixes: Solaris, Sunos, Linux, SCO, Aix, BSD and HP-UX but it's not necessarily built-in; you may have to search for it on the net.
Tony Lawrence
SCO Unix/Linux Resources tony@pcunix.com
 
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thankyou, but what if they are connected, but not using any files?
 
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Everything is a file :)

If you have a network connection, it is a file (in the abstract- it'a actually a socket, but the semantics are file-like).

The "lsof" program shows the pid's associated with files and sockets.

Tony Lawrence
SCO Unix/Linux Resources tony@pcunix.com
 
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try the command "w" display information about currently logged-in users

this will tell you which users are actually working, what command they are currently executing, how long they have been idle or just sitting in shell

 
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just out of curiosity, i am familiar with the everything as a file concept in unix, but where are the sockets, which are actually files, stored on my partition?
 
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I don't think they are, it's just that you read and write from them as *if* they were files. Mike
michael.j.lacey@ntlworld.com
Email welcome if you're in a hurry or something -- but post in tek-tips as well please, and I will post my reply here as well.
 
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socket - is an endpoint for communication and not a file
see man pages for netstat and socket
netstat -a shows the state of all sockets for each protocol
 
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no no hurry. if they are not files as such (and i thought everything was a file under unix) then how can lsof display them?
 
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