#!/bin/bash ipv4_regx="((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]).){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])"

grep '23/Apr/2020' nowcoder.txt | grep -Eo ipv4_regx | sort | uniq -c | awk '{print 1,$2}' | sort -r -t ' ' -k 1