Simple Bash Script to execute a command on the router through telnet command

execute_on_router.sh

#!/bin/sh
# replace cmd1 for the command to execute

host=192.168.1.1
port=23
user=admin
pass=02B08
cmd1='adsl info'
current_date_time="`date +%Y-%m-%d\ %H:%M:%S`";
( echo open ${host}
sleep 1
echo ${user}
sleep 1
echo ${pass}
sleep 1
echo ${cmd1}
sleep 2
 ) | telnet | tee -a txt.txt 
 echo $current_date_time | tee -a txt.txt