Re: Detecting whether a session is locally or remotely log ged in

On Friday 26 August 2005 12:10, Tony Langdon (ATC) wrote:
> > Are you trying to determine this from within the shell session or
> > by looking at it from the outside?
>
> Within the session
>
> > If you're doing it from within the shell, then ssh usually sets a
> > few env variables which might be helpful.  eg. SSH_CLIENT,
> > SSH_CONNECTION,
> > SSH_TTY.  There might be others too...  Obviously, they won't be
> > present if the shell is local to the system.
>
> I saw those.  Thay might cover the cases I need to deal with, though
> there is a small probability of remote X sessions (which I also want
> the script to avoid)...

In those cases, will the DISPLAY value help?  I'd have thought you would 
be able to tell the difference that way:
	:0 = local
localhost:0 = local
foo.domain.com:N = local (regardless of 'N') if machine is really 
foo.domain.com

anything.else.com:N = remote display

If you're doing X over ssh, then when forwarding X connections, I think 
sshd controls which offset to start display numbering, so maybe parse 
$DISPLAY & work from there.

Cheers,

- Brendon.

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