Hi @Aditya ,
I just moved this to a new topic from the original QIIME 2 to BugBase tutorial.
Can you describe what you mean by running forever?
This command is simply replacing the original 97_otu_taxonomy.txt with the added new headers. So you won't see a new file, though perhaps that is not an ideal approach on my end. Regardless, it should take no time at all. Type head 97_otu_taxonomy.txt, if you see #OTUID and taxonomy in the first row then it has worked properly and you can move on.
p.s I updated that tutorial a bit just now.