The author discovered that typing `??` in the Terminal when Golang is installed brings up the Golang command line interface.
After investigating, they found that the `??` command is being expanded by the shell to match any two-character filename or directory entry in the current working directory. The global binary file location resolving has a higher priority than the local filename or directories. They also found it interesting that the expanded filenames or directories can be used to execute commands or scripts.
