[ILUG] Identifying telnet connections?

[Kevin Dobey]

Relating to your awk problem...

if you do something like 
who | awk '/'$USER'/' {print $6} ' 
the $USER gets expanded into the awk command. 
	(you can muck this approach into your requirement) 

Even better - 
 export Myip=`who | awk '/'$USER'/ {print substr(substr ($6,2),1,length($6)
- 2 ) }' | tail -1`

That will strip out the braces either side of the IP address aswell 
feel free to add a ":0" string to the end as you like !!

I have a DHCP'ed address here so it can change on me so on my AIX log on I
have a line that does something similar...

export MYIP=`who -q | grep $LOGNAME | head -1 | cut -f2 -d "(" | cut -f1
-d")"` 
export DISPLAY=$MYIP:0

I didn't know about awk at the time.

However this has some core problems !!
If I start at "mypcclient" and go to "unixbox1" and go to "unixbox2" then my
display will be set to "unixbox1:0" by this script. 

Of course that's no good at all. 
Also if the ip address is in the name form and is long who cuts it short it
short
perhaps if I used last (which I learned about today - thank you ILUG) it
would be better. 

Of course "who am i" or "who -m" (thanks again ILUG) would be better. 
But thats academic. 

-----Original Message-----
From: Paul Jakma [mailto:Paul.Jakma at Digital.com]
Sent: 03 June 1999 10:20
To: 'Tony_Melia at Dell.com'
Cc: 'ilug at linux.ie'
Subject: RE: [ILUG] Identifying telnet connections?


ok.. i misunderstood, sorry.

maybe something along the lines of:

export DISPLAY=`last -a -n 1 $USER | awk '/mydomain.ie/ { print $10 }'`

would do the trick.

it works for me, the reason for using the domain name is cause i can't see
how to get the username into the awk pattern, eg:

awk '/$USER/ { print $10}' doesn't work cause the awk command string isn't
parsed by bash.

and awk '/ENVIRON["USER"] {print $10 }' doesn't do it either.

any awk/perl hackers out there?

hth,

paul.

> ----------
> From: 	Tony_Melia at Dell.com[SMTP:Tony_Melia at Dell.com]
> Sent: 	03 June 1999 09:27
> To: 	Paul Jakma
> Subject: 	RE: [ILUG] Identifying telnet connections?
> 
> windows....crt...also I tried standard windows nT telnet.
> I just tried linux>linux telner (both RH6) and it says unable to open
> display %s.  so I presume it expects the %s paramater to the the
> variable....???
> 

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