To obtain Cisco Switch and Router configuration automatically, we can compile one bash shell script combining UNIX CRON to backup configuration regularly:

#!/bin/bash

router=10.10.10.10
password=cisco
enable_mode='enable'
enable_password=cisco
term_length="terminal length"
cmd='show run'

echo open $host
sleep 1
echo $password
sleep 1
echo $enable_mode
sleep 1
echo $enable_password
sleep 1
echo $term_length 0
sleep 1
echo $cmd
sleep 1
echo $term_length 24
sleep 1
echo exit

如果以上的程式名稱為telnet.sh，我們便可以在命令提示字元（prompt)下達指令：

./telnet.sh | telnet

就可以得到IP位址為10.10.10.10的Cisco交換器或是路由器的組態設定了。