Specs

read(Path.t()) :: {:ok, binary()} | {:error, posix()}

Returns {:ok, binary}, where binary is a binary data object that contains the contents of path, or {:error, reason} if an error occurs.

Typical error reasons:

• :enoent - the file does not exist
• :eacces - missing permission for reading the file, or for searching one of the parent directories
• :eisdir - the named file is a directory
• :enotdir - a component of the file name is not a directory; on some platforms, :enoent is returned instead
• :enomem - there is not enough memory for the contents of the file

You can use :file.format_error/1 to get a descriptive string of the error.