#!/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 -Eo ipv4_regx nowcoder.txt | sort | uniq -c | awk '{if(1 > 3) print 2}' | sort -r -t ' ' -k 1

#!/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 -Eo ipv4_regx nowcoder.txt | sort | uniq -c | awk '{if(1 > 3) print 1,2}' | sort -r -t ' ' -k 1