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      <h1>
        <small class="visible-xs">Mix v1.7.2</small>
mix cmd        
          <a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/mix/lib/mix/tasks/cmd.ex#L1" title="View Source" class="view-source" rel="help">
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        <section id="moduledoc">
<p>Executes the given command.</p>
<p>Useful in umbrella applications to execute a command
on each child app:</p>
<pre><code class="nohighlight makeup elixir"><span class="n">mix</span><span class="w"> </span><span class="n">cmd</span><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="n">pwd</span></code></pre>
<p>You can limit which apps the cmd runs in by passing the app names
before the cmd using —app:</p>
<pre><code class="nohighlight makeup elixir"><span class="n">mix</span><span class="w"> </span><span class="n">cmd</span><span class="w"> </span><span class="o">--</span><span class="n">app</span><span class="w"> </span><span class="n">app1</span><span class="w"> </span><span class="o">--</span><span class="n">app</span><span class="w"> </span><span class="n">app2</span><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="n">pwd</span></code></pre>
<p>Aborts when a command exits with a non-zero status.</p>
<h2 id="module-zombie-os-processes" class="section-heading">
  <a href="#module-zombie-os-processes" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
  Zombie OS processes
</h2>

<p>Beware that the Erlang VM does not terminate child processes
when it shuts down. Therefore, if you use <code class="inline">mix cmd</code> to start
long running processes and then shutdown the VM, it is likely
that those child processes won’t be terminated with the VM.</p>
<p>A solution is to make sure the child processes listen to the
stdndard input and terminate when standard input is closed.
We discuss this topic at length in the “Zombie OS processes”
of the <a href="https://hexdocs.pm/elixir/Port.html"><code class="inline">Port</code></a> module documentation.</p>
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            Summary
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      <a href="#functions">Functions</a>
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    <a href="#run/1">run(args)</a>
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    <div class="summary-synopsis"><p>A task needs to implement <code class="inline">run</code> which receives
a list of command line args</p>
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            Functions
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    <span class="signature">run(args)</span>
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<p>A task needs to implement <code class="inline">run</code> which receives
a list of command line args.</p>
<p>Callback implementation for <a href="Mix.Task.html#c:run/1"><code class="inline">Mix.Task.run/1</code></a>.</p>
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