4. Matching paths with.md

Run the command with the cwd of home/hacker and specifying the absolute path of the directory where the files are located,

$ /challenge/run /challenge/files/file_[bash]

We get the flag pwn.college{kctikvrM1KnbZ1YZ0JtbT2wuZoj.dRjM4QDL3kTO0czW}