Exercise 2.1 may need revision

After trying for a quite while, I eventually found that in order to get any result from running "rostopic list | grep ‘/counter’’’, I have to execute my program in another Webshell and don’t kill it. But it didn’t say anything about this in the notebook.

Maybe they should revise it?

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Hey @wangxiaolong0830,

Thanks for your suggestion and welcome to the Community!

Yes, I think you are right - we’ll take that into consideration when reviewing the course.

Thanks again!