Check for IP validity

Question

How do I check the validity of an IP address in a shell script, that is within the range 0.0.0.0 to 255.255.255.255?

Answer 1

i tweaked all the codes and found this to be helpful.

#!/bin/bash

ip="256.10.10.100"

if [[ "$ip" =~ (([01]{,1}[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.([01]{,1}[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.([01]{,1}[0-9]{1,2}|2[0-4][0-9]|25[0-5])\.([01]{,1}[0-9]{1,2}|2[0-4][0-9]|25[0-5]))$ ]]; then
  echo "success"
else
  echo "fail"
fi