you may know what a man is his company什么意思

应该是：通过（他工作的）公司，你可以知道一个人是什么样的人。
man应该是泛指人，而不是男人。
by作为介词，有“通过……（某种方式）”的含义

字面意思好像是：通过交往就会知道这是个什么样的人

你可以通过公司知道他是什么人。

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