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语法高亮，滚动条美化，设置页面调整

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docs/linux/help.html
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<h2 id="补充说明">补充说明</h2>
<p><strong>help命令</strong> 用于显示shell内部命令的帮助信息。help命令只能显示shell内部的命令帮助信息。而对于外部命令的帮助信息只能使用man或者info命令查看。</p>
<h3 id="语法">语法</h3>
<pre><code>help(选项)(参数)</code></pre>
<pre><code class="language-bash">help(选项)(参数)</code></pre>
<h3 id="选项">选项</h3>
<pre><code>-s：输出短格式的帮助信息。仅包括命令格式。</code></pre>
<pre><code class="language-bash">-s：输出短格式的帮助信息。仅包括命令格式。</code></pre>
<h3 id="参数">参数</h3>
<p>内部命令：指定需要显示帮助信息的shell内部命令。</p>
<h3 id="实例">实例</h3>
<p>使用help命令显示shell内部shopt命令的帮助信息，输入如下命令：</p>
<pre><code>help shopt #获取shopt命令的帮助信息
<pre><code class="language-bash">help shopt #获取shopt命令的帮助信息
shopt: shopt [-pqsu] [-o long-option] optname [optname...]
Toggle the values of variables controlling optional behavior.
The -s flag means to enable (set) each OPTNAME; the -u flag