Shell Programming and Scripting

hi all ,

iam trying to telnet to a remote system (A) that is 2 routers away ,
the problem is that when i telnet to the system my IP is changed due to natting b/w the 2 networks .
i want to do a remote backup of the system (A) from a server (B), using the following script :

#! /usr/bin/ksh
DELAY=3
PASSWD=passwd
USER=root
exec 4>&1
telnet 192.168.x.xx >&4 2>&4 |&
sleep $DELAY
print -p $USER
sleep $DELAY
print -p $PASSWD
sleep $DELAY
print -p IP=`last -1 |awk '{print $3}'`
print -p sleep $DELAY
print -p ufsdump 0uf $IP:/dev/rmt/1 /
print -p ufsdump 0uf $IP:/dev/rmt/1 /data
print -p ufsdump 0uf $IP:/dev/rmt/1 /data1
wait
print -p exit
wait


but the problem is that when iam doing "IP=`last -1 |awk '{print $3}'`" iam getting my local IP and not the one that is recognized by (A)
that is if i do last -1 on (A) i get something like 192.168.x.x while the value of the script variable IP is 172.16.x.x
iam using solaris 8 (A) , solaris 9 (B) over SPARC.
thanks for ur help.

You're really painted deep into a corner here. With a very different concept in the script, you might be able to do something like:

print -p last -1 |awk '{print $3}'
read -p IP

But it would be very hard (perhaps impossible) to to position everything correctly to get that to work. Switching to expect could work. I would just hard code te return IP address. But you could get this to work using a sequence of 3 ksh co-processes. First telnet in and do:
print -p last -1 |awk '{print $3}' > IPFILE
Then use an ftp co-process to retrieve that file. Read it to get the value for IP. Finally run the third co-process which is a telnet session that does the backup.

It occurred to me that the IP variable doesn't need to be set in the local shell.
print -p 'ufsdump 0uf $IP:/dev/rmt/1 /'
will cause the remote shell to expand IP. So to set IP, do something like this:
print -p 'IP=`last -1 |awk \'{print $3}\'`'

thanks Perderabo i will try it and post my feedback...
thank u once again .

sorry it is not happy yet, i got the following error .

syntax error at line 20 : ``' unmatched

i have never used "expect scripting " is it easier to implement it in my case .
cause really i think that iam way over my head , i have treid everything i know and it is still not working .

Cut and paste the line that is causing you trouble. This is a simple quoting problem.

i have used what u posted : print -p 'IP=`last -1 |awk \'{print $3}\'`' and it gave me the above error .