File.cwd

You're seeing just the function cwd, go back to File module for more information.

Specs

cwd() :: {:ok, binary()} | {:error, posix()}

Gets the current working directory.

In rare circumstances, this function can fail on Unix-like systems. It may happen if read permissions do not exist for the parent directories of the current directory. For this reason, returns {:ok, cwd} in case of success, {:error, reason} otherwise.