What I am trying to do is kind of hard to explain. Let's say I have a directory with a bunch of different users submitting stuff into it. I ask for a file with the extension ".foo" from everyone. Then I asked for a file with the extension ".bar" from everyone. I want a list of names of everyone who submitted .foo, but did not submit .bar.What I am trying to do is kind of hard to expla
阅读背景：
如何找到一个目录中有一个文件但没有另一个文件的文件所有者
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