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<script type="text/x-red" data-help-name="exec">
<p>运行系统命令并返回其输出</p>
<p>可以将节点配置为等待命令完成或者在命令生成时发送其输出</p>
<p>运行的命令可以在节点中配置也可以由收到的消息提供</p>
<h3>输入</h3>
<dl class="message-properties">
<dt class="optional">payload <span class="property-type">字符串</span></dt>
<dd>如果这样配置则将被附加到执行命令中</dd>
<dt class="optional">kill <span class="property-type">字符串</span></dt>
<dd>指定发送到现有的exec节点进程的kill信号类型</dd>
<dt class="optional">pid <span class="property-type">数值|字符串</span></dt>
<dd>要杀死的现有exec节点进程的进程ID</dd>
</dl>
<h3>输出</h3>
<ol class="node-ports">
<li>标准输出(stdout)
<dl class="message-properties">
<dt>payload <span class="property-type">字符串</span></dt>
<dd>命令的标准输出</dd>
</dl>
<dl class="message-properties">
<dt>rc <span class="property-type">object</span></dt>
<dd>仅执行模式一个返回代码对象的副本在端口3上也可用</dd>
</dl>
</li>
<li>标准error输出(stderr)
<dl class="message-properties">
<dt>payload <span class="property-type">字符串</span></dt>
<dd>命令的标准错误输出</dd>
</dl>
<dl class="message-properties">
<dt>rc <span class="property-type">object</span></dt>
<dd>仅执行模式一个返回代码对象的副本在端口3上也可用</dd>
</dl>
</li>
<li>返回代码
<dl class="message-properties">
<dt>payload <span class="property-type">object</span></dt>
<dd>一个包含返回代码以及<code>message</code><code>signal</code></dd>
</dl>
</li>
</ol>
<h3>详细</h3>
<p>默认情况下使用<code>exec</code><code>{code0}</code></p>
<p>可选可以选择使用<code>spawn</code>stdoutstderr<code>{code0}</code></p>
<p>错误可能会在第三个端口<code>msg.payload</code><code>message</code><code>signal</code></p>
<p>运行的命令是在节点内定义的带有附加<code>msg.payload</code></p>
<p>带空格的命令或参数应该用引号引起来<code>这是一个参数</code></p>
<p>返回的<code>payload</code>通常是<i>字符串</i>类型除非检测到非UTF8字符在这种情况下它会是<i>buffer</i></p>
<p>节点处于活动状态时该节点的状态图标和PID将可见对此更改可以通过<code>Status</code></p>
<h4>杀死进程</h4>
<p>发送<code>msg.kill</code><code>msg.kill</code><code>SIGINT</code><code>SIGQUIT</code><code>SIGHUP</code><code>SIGTERM</code></p>
<p>如果节点有多个进程在运行则还必须设置<code>msg.pid</code>PID</p>
<p>如果<code>Timeout</code></p>
<p>提示如果运行Python应用程序则可能需要使用<code>-u</code></p>
</script>