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This question already has an answer here:

How do I use the /testfor command in a command block to test for a specific word that a Minecraft player playing on the server says. For my example, if a player says:

[Player] - Hi

The command block then says:

[Command Block] - Hello.

Please help, just trying to create a cool command =) {If This Works Please Tell Me}

marked as duplicate by aytimothy, user106385, Dragonrage, Unionhawk, galacticninja Jun 2 '16 at 5:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

2

You just can't.

As per current, command blocks cannot read from the chat line.

Read this answer for more information.

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