Listing 1 Bash script: get_info

#!/bin/bash

JMPSERVER=jump.myisp.net
PORT=9012

LOGINSEQ=('secret1' 'myadm' 'secret2')
CMDS=('date' 'info' 'uptime' 'quit')

while read device
do

   # In background, run an ssh tunnel
   ssh  -N ${JMPSERVER} -L ${PORT}:${device}:23 &
   sleep 2

   for n in 1
   do
      # login sequence
      typeset -i i=0
      while test ${i} -lt ${#LOGINSEQ[*]}
      do
          echo ${LOGINSEQ[${i}]}
          i+=1
          sleep 1
      done

      # run commands
      typeset -i j=0
      while test ${j} -lt ${#CMDS[*]}
      do
          echo ${CMDS[${j}]}
          j+=1
          sleep 1
      done
   done | telnet localhost ${PORT}
   kill $! # terminate the ssh background process

done