necessary solution of delete_files-challenge is inconsistent with challenge description
The README of delete_files states:
# Delete all of the files in this challenge # directory including all supdirectories and # their contents.
As the challenge is speaking of "delete […] in this challenge directory […]", 'rm -rf *' should do the trick (if there was no 'cd' before). However, this does not solve the challenge. Wiping the entire system 'rm -rf /*' is, however, sufficient, being inconsistent with the challenge description.