Hi, there!

33. "remove every backend project that uses node third party packages, they might has backdoor that could use your VPS as their VPS to act like a general web client for hackers"   it is even worse if you use npm in root VPS, because the npm will always use new version of a package or sub_package, how can you make sure your 3000 dependencies will not have a virus that could use your VPS root permission to do bad things?   it is the same for other package manager, for example, python pip. or golang package, java package, rust package, flutter package. in chinese, people usally call those machine that has those software running 'rou ji'. """ 利用 package manager 自动更新新版本的特性，做远控 轻而易举 就算不更新，利用现有的package，二进制文件或者脚本 一个post发到黑客服务器，它就知道你的电脑能不能被控制 对于root设备，被控制就是被完全控制，对于普通设备，就是被当成hacker web 客户端，可以被拿来在网上发垃圾信息、垃圾账号注册 到时候你的ip就会被当成坏ip被服务器墙掉 """

How to stabilize temperature to a fixed number, for example, 38.5? You use a micro_controller to control an electrical relay, and that relay controls a heater which will raise temperature. For example, when temperature is lower than 38.5 degree, we power on the heater. And when the temperature is greater than 38.5 degree, we power off that heater. In real life, that temperature will not be a stable number, it may get changed between 2 or 3 degrees. How do you fix this problem? You use PID controller. Which is, when the temperature is close to 38.5, for example, 38, we decrease the power of the heater. For example, we turn 220 voltage to 60 voltage. So the temperature will slowly reach 38.5. The real meaning of PID controller is: When you about to reach a target, you use less energy to do small move to reach that target. When you far away from the target, you use big energy to reach that target. So that you would always track that target closely. You can use the temperature of 38.5 degr...

Some command lines you should know  ifconfig ipconfig ip address ping 192.168.1.1 telnet 192.168.1.1 22 ssh root@192.168.1.1 finger sudo -s iptables -S netstat -rn netstat traceroute 10.0.2.15 rustscan -a 10.0.2.15 -- -Pn -t 10000 nslookup google.com dig bing.com nmap 127.0.0.1 rustscan -a yandex.com -- -Pn -t 10000 whois baidu.com whois yingshaoxo.xyz xdg-open 'google.com/search?q=yingshaoxo' More information Search for: hacking path with xxx Search for: how to xxx ​