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Why is it wrong to use the command again after deleting the file with rm?

But the result of my first use is correct. After deleting junk2 with the rm command, it is wrong to use the ls | wc -w | tee junk2 command again? Similarly, I use the touch command to create the file kk, and then delete the file kk. The result of using'ls | wc -w' is different from the result of...

When I did not create the file junk2 by any means, the output of ls | wc -w was the same as the output of ls | wc -w | tee junk2. When I delete the (rm) junk2 file and output the same command again, the results of the two are inconsistent