From 571f12a8d7346aa3f684f2305f7e1c739301b0d6 Mon Sep 17 00:00:00 2001
From: chunzhi <chunzhi233233@gmail.com>
Date: Thu, 8 Feb 2024 14:00:22 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20choose-cn.sh?=
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---
 choose-cn.sh | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 choose-cn.sh

diff --git a/choose-cn.sh b/choose-cn.sh
new file mode 100644
index 0000000..96f1ee1
--- /dev/null
+++ b/choose-cn.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# 使用 dig 命令查询 DNS 记录并写入 ip.txt
+dig cf.youoffer.net A +short > ip.txt
+
+# 创建一个新的文件 ip_use.txt
+touch ip_use.txt
+
+# 读取 ip.txt 中的每个 IP 地址进行下载测试
+while IFS= read -r ip
+do
+    echo "Starting download test for $ip"
+    # 使用 curl 命令进行下载测试
+    start_time=$(date +%s.%N)
+    curl -s --resolve speed.cloudflare.com:443:"$ip" https://speed.cloudflare.com/__down?bytes=10000000 -o /dev/null --connect-timeout 5 --max-time 10
+    curl_status=$?
+    end_time=$(date +%s.%N)
+    elapsed_time=$(echo "$end_time - $start_time" | bc)
+    
+    # 检查 curl 命令的返回状态
+    if [ $curl_status -eq 0 ]; then
+        # 计算下载速度
+        download_speed=$(echo "scale=2; (10000000*8)/(($elapsed_time)*1000000)" | bc)
+        
+        # 显示下载速度
+        echo "$ip has a download speed of $download_speed Mbps"
+        
+        # 如果下载速度大于等于 50Mbps
+        if (( $(echo "$download_speed >= 50" | bc -l) )); then
+            # 将大于等于 50Mbps 的 IP 写入 ip_use.txt
+            echo "$ip" >> ip_use.txt
+        fi
+    else
+        echo "Download test for $ip failed with status $curl_status"
+    fi
+done < ip.txt
+
+# 重命名 ip_use.txt 为 final_ips.txt，因为 ip_use.txt 在循环中被touch过，可能包含旧数据
+mv ip_use.txt final_ips.txt
+
+echo "Download tests completed. IPs with download speed >= 50Mbps are written to final_ips.txt"