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Accepted
Drew Noakes
Asked: 2014-02-15 14:57:34 +0800 CST

Determining the name of the host currently connected via SSH

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When logging in via SSH, I'd like to know, during the execution of .bashrc, the name of the host that is connecting.

Ubuntu Server shows the prompt:

Last login: Fri Feb 14 11:34:55 2014 from somehost.local

...so this information is available somewhere.

How can I access it?

bash

2 Answers

  1. Best Answer

    If you type:

    who

    You'll see information about the logged in users. Amongst other things, you can see the host they're logged from. For instance, right now my laptop returns this:

    who -u
darent   tty6         2014-02-14 01:15 11:02       20339
darent   tty7         2014-02-14 23:15  antic      31827 (:0)
darent   pts/7        2014-02-14 23:14 00:46       30246 (helena.local)
darent   pts/1        2014-02-14 23:16   .          1466 (:0)
darent   pts/9        2014-02-14 23:19 00:25         302 (:0)

    Where helena.local is the computer from which I'm connected trough ssh.

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  2. ssh sets the environment variable $SSH_CONNECTION to contain client IP address, client port number, server IP address, and server port number seperated by spaces.

    You can use

    echo ${SSH_CONNECTION%% *}

    to get the client's IP address. To get the DNS name use something like host or dig -x:

    host ${SSH_CONNECTION%% *}
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