我们在用命令ng serve --port 时经常遇到错误消息：
ubuntu@ip-172-31-12-185:-/KOI/Template/front-end$ ng serve --port 3000Port 3000 is already in use. Use ‘–port’ to specify a different port.Error: Port 3000 is already in use. Use ‘–port’ to specify a different port.at Server. server.once (/home/ubuntu/KOI/Template/front-end/node_modules/@angular-devkit/build-angular/srcngular-cli-files/utilities/check-port.js:27:28)
at object. onceWrapper (events.js:315:30)
at emitone (events.js:116:13)
at server. emit (events.js:211:7)
at emitErrorNT (net.js: 1387:8)
at _combinedTickCallback (internal/process/next_tick.js: 138:11)at process._tickcallback (internal/process/next_tick.js: 180:9)
如何查到哪一个进程占用了端口3000？
命令netstat -tulpn，发现是进程 15089占用了3000.
再使用ps -aux就能找到该进程的路径了。
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