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linux check port open

linux check port open

I want to install webserver-apache on a Linux platform which uses port no.80 but I am not sure whether is port is open or not , and being used by some other application or not.

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Nmap是一套開放原始碼的軟體，它的功能主要是網路探測和安全稽核，能快速掃描大型網絡，並檢測本機或網路遠端主機的安全性弱點，進行弱點分析，有助增強系統及網路安全服務。 靈活：支援幾十種網絡技術，包含IP過濾器、防火牆、路由器和其他障礙。 ...

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