The following shell script splits an IP into separate Octets into its own variables. This method can be used for any script which needs to take each octet into account, such as generating firewall rules etc.
#!/bin/bash echo -n " Enter the IP Address (Example: 192.168.160.0): " read IP oct1=$(echo ${IP} | tr "." " " | awk '{ print $1 }') oct2=$(echo ${IP} | tr "." " " | awk '{ print $2 }') oct3=$(echo ${IP} | tr "." " " | awk '{ print $3 }') oct4=$(echo ${IP} | tr "." " " | awk '{ print $4 }') echo "IP Address is $oct1.$oct2.$oct3.$oct4"