problem in downloading

[ZiadElgammal]

hello,
I have been trying to download the dataset but each time I get stuck at step 4: Run the auto-generated WSI script."bash ./wsis/download_wsis.sh"
I tried on both Colab and Jupyter notebook and they give the same output "UsageError: Line magic function %bash. not found."
as I am still a beginner, I can't find the real problem and fix it.
can you help me?
Thank you.

https://colab.research.google.com/drive/1cyAqtvSDahzkCURobR4mp5J-8zcsopwi?usp=sharing