A list of all available configuration variables can be obtained using. An IP address is basically a dot separated sequence of 4 numbers each having 1 to 3 digits. On success, the command returns the exit code 0. These basic building blocks give you everything you need for almost any situation. You also added the uniq command to filter the addresses into a list. You’ve used grep and regular expression syntax to search for IP addresses in a log file. Inet 192.168.201.1 netmask 255.255.255.0 broadcast 192.168.201.255 Now if you want to search for lines containing IP addresses, you’ll need to use some regular expressions. In this case, the two IP addresses appeared 42 and 16 times. Note: The script is based on the output of ifconfig in Ubuntu 16.04. ifconfig | head -19 | sed 'wlan0|\eth0' | awk '' Finally, we test the function against a few examples: validipv4 127.0.0.1 IP address is valid validipv4 192.168.09.1 IP address is invalid validipv4 325.42.5. Next, we source the script to make the function available. I've come so close, so far i have tried about a million possible combinations but I'm close to exhausted, this is some of what i have tried. Otherwise, we consider the IP address to be valid. I'm trying to learn as much as possible about Linux, I'm currently stuck at trying to grab specific parts of my ifconfig text display so it looks exactly like this: eth0:
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