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After logging onto a linux machine via SSH, I would like to be able to retrieve the name of the computer from which the connection was made. Ideally I am looking for some command like hostname or uname but that would retrieve the name of the client instead of the host.

This information must be accessible somewhere, since when I log on I get a message that contains the clinent name from the last login:

Last login: Thu Mar 11 18:42:01 2010 from my.address.com


The reason for wanting to do this is to be able to take different action in my .login file depending on which computer I am currently connecting from.

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1 Answer

up vote 3 down vote accepted

Short answer:

who -m

For bonus marks (yes, this is filthy, someone please leave a comment as to how to do it better):

who -m | awk '{print $5;}' | sed s/\(// | sed s/\)//

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That was a quick answer, thanks! –  amicitas Mar 12 '10 at 9:31
    
@amicitas: Check again, I made it better :D Upvote if it helped you! –  Alexander Burke Mar 12 '10 at 9:32
    
Thanks, I was about to spend the next 30 minutes trying to remember how to use awk and sed again. –  amicitas Mar 12 '10 at 9:40
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This is even cleaner :-): who -m | awk -F '[()]' '{print $2}' –  janmoesen Mar 12 '10 at 11:46
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Also note that there is a more reliable variable: SSH_CLIENT has the client IP address (and server and client port). SSH_CONNECTION adds the server IP address. –  janmoesen Mar 12 '10 at 11:48
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