NC -lk 7777 Error: nc: invalid option –k [How to Solve]

Recently, I am learning Flink to simulate real-time data through NC. However, when you enter NC -lk 7777 under windows, the following error is reported:

C:\Users\7371>nc -lk 7777
nc: invalid option -- k
nc -h for help

After some searching, it was finally solved
windows is different from Linux. You can enter NC - L - P 7777 directly after CMD

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