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我对 Elixir 很陌生，我正在尝试运行 iex。当我在命令行中输入“iex”时，出现以下错误：

Erlang/OTP 20 [erts-9.0.5] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async->threads:10] [hipe] [kernel-poll:false] [dtrace]

** (Mix) "mix" with no arguments must be executed in a directory with a >mix.exs file

Usage: mix [task]

Examples:

    mix             - Invokes the default task (current: "mix run")
    mix new PATH    - Creates a new Elixir project at the given path
    mix help        - Lists all available tasks
    mix help TASK   - Prints documentation for a given task

我目前正在使用 Elixir 1.5.1/Erlang 20

为什么 Elixir 需要一个 mix.exs 文件来运行 shell？

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