Filter Web Server Access Logs by IP or Status Code

#!/bin/bash

LOG_FILE="/var/log/nginx/access.log"
FILTER_IP="192.168.1.1"
FILTER_STATUS="404"

echo "Filtering logs for IP: $FILTER_IP and Status: $FILTER_STATUS"

grep "$FILTER_IP" "$LOG_FILE" | grep "HTTP/1.[01]" $FILTER_STATUS" | head -n 10

How it works: This script demonstrates how to filter web server access logs using `grep`. It first filters by a specified IP address and then pipes the output to another `grep` command to filter by a specific HTTP status code (e.g., 404 Not Found). The `head -n 10` limits the output to the first 10 matching lines for a quick preview. This is highly useful for identifying requests from specific sources or errors in large log files during web application debugging.