getting remote ip in bash script

[Hal Duston]

On Thu, 30 Jan 2003, Charles Steinkuehler wrote:

> Eric R. wrote:
> > Hey LugNuts,
> > 
> > I'm trying to whip up a bash script that will report to the user at 
> > logon, the logon id, IP they came from, etc.
> 
> <snip>
> 
> > I tried netstat, and piped it to cut -c45-65 but that gave me every 
> > connection that netstat sees... LOL!!! not the desired effect!!
> 
> NOTE: The $SSH_CLIENT variable is passed to the script...once the script 
> runs, the environment variables set by ssh disappear, and I was unable 
> to figure out any other means of extracting the remote IP (at least 
> easily in a script...I could probably crawl through proc or something, 
> but that seemed hard :)
> 
`who' gets it from utmp.

REMOTE_IP=`who am i|sed 's/^[^(]*(([0-9.]*):.*$/1/'`

Tested on debian, probably not portable, modify as needed.

Hal