Ex 10/13 grep | don't work!

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https://www.codecademy.com/courses/learn-the-command-line/lessons/redirection/exercises/grep-i#

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just look ! i don’t understand !
someone can help me it’s cool !

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If you search for the substring “atnuhaoehutnhaotnuhtnaouhtna” then you’ll get 0 results. Does that mean grep isn’t working? I call that working very well, because there are 0 matches, so printing them all means producing exactly no output.
To get a result you can add that substring to one of the files, or perhaps search for something that is in the files.

that makes no sense.

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