零基础网络安全入门指南：学习路径与核心技能解析 | 极客日志

零基础网络安全入门指南：学习路径与核心技能解析 | 极客日志

import socket

def scan_port(ip, port):
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(1)
        result = sock.connect_ex((ip, port))
        if result == 0:
            print(f"Port {port} is open")
        else:
            print(f"Port {port} is closed")
        sock.close()
    except Exception as e:
        print(f"Error: {e}")

scan_port("127.0.0.1", 80)

#!/bin/bash
# 统计访问次数最多的 IP
awk '{print $1}' access.log | sort | uniq -c | sort -nr | head -10

#include <stdio.h>
int main() {
    int arr[5] = {1, 2, 3, 4, 5};
    int *ptr = arr;
    printf("%d\n", *(ptr + 2)); // 输出 3
    return 0;
}