- Command
grep -o "[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" /var/log/nginx/access.log
- Unique IPs
grep -o "[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" /var/log/nginx/access.log | sort | uniq
- Number of times each IP
grep -o "[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" /var/log/nginx/access.log | sort | uniq -c
Or
grep -o "[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" httpd.log | sort | uniq -c | sort -n