DataCamp's classes so far enforce unnecessary redundancy. Instead of @grep search-term filename | sort | uniq@, they require @cat filename | grep search-term | sort | uniq@ ... in Python3, they require @print(arrayname[index])@ when the py3 REPL will display it with @arrayname[index]@

Also, they use @bash scriptname arguments@ but break when you use @sh scriptname arguments@ instead.

I understand that, because many tutorials and courses teach such practices. But I wish their little playground gave options to use the other way also.