Something

#!/bin/sh
clear
echo "At anytime you can type: \"info\" to get more info on the item."
echo " "
printf "IP Address?: "
read ip

if [ "$ip" == "info" ]; then
        info=`cat test.txt`
        echo "$info"
        echo " "
        printf "IP Address?: "
        read ip
fi

ipchk=`ifconfig 2>&1 | grep inet | grep -v inet6 | awk '{print $2}' | grep "$ip"`

while [ "$ipchk" != "$ip" && "$ipchk" != "info" ]
  do
        echo "Invalid Ip"
        echo " "
        printf "IP Address?: "
        read ip
        ipchk=`ifconfig 2>&1 | grep inet | grep -v inet6 | awk '{print $2}' | grep "$ip"`
  done

echo "IP: $ip"


## results ##

# get-test
At anytime you can type: "info" to get more info on the item.

IP Address?: info
[: info: unexpected operator
[: missing ]
IP: info