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<li class="toctree-l2"><a class="reference internal" href="#">基础命令</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#">后台异步任务</a></li>
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<li class="toctree-l3"><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">ognl表达式的用法说明</a></li>
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<span id="id1"></span><h1>进阶使用<a class="headerlink" href="#" title="永久链接至标题">¶</a></h1>
<div class="section" id="">
<span id="id2"></span><h2>基础命令<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li>help——查看命令帮助信息</li>
<li>cls——清空当前屏幕区域</li>
<li>session——查看当前会话的信息</li>
<li><a class="reference internal" href="reset.html"><span class="doc">reset</span></a>——重置增强类，将被 Arthas 增强过的类全部还原，Arthas 服务端关闭时会重置所有增强过的类</li>
<li>version——输出当前目标 Java 进程所加载的 Arthas 版本号</li>
<li>quit——退出当前 Arthas 客户端，其他 Arthas 客户端不受影响</li>
<li>shutdown——关闭 Arthas 服务端，所有 Arthas 客户端全部退出</li>
<li><a class="reference internal" href="keymap.html"><span class="doc">keymap</span></a>——Arthas快捷键列表及自定义快捷键</li>
</ul>
</div>
<div class="section" id="jvm">
<span id="jvm"></span><h2>jvm相关<a class="headerlink" href="#jvm" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a>——当前系统的实时数据面板</li>
<li><a class="reference internal" href="thread.html"><span class="doc">thread</span></a>——查看当前 JVM 的线程堆栈信息</li>
<li><a class="reference internal" href="jvm.html"><span class="doc">jvm</span></a>——查看当前 JVM 的信息</li>
<li><a class="reference internal" href="sysprop.html"><span class="doc">sysprop</span></a>——查看和修改JVM的系统属性</li>
<li><strong>New!</strong> <a class="reference internal" href="getstatic.html"><span class="doc">getstatic</span></a>——查看类的静态属性</li>
</ul>
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<span id="class-classloader"></span><h2>class/classloader相关<a class="headerlink" href="#class-classloader" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="sc.html"><span class="doc">sc</span></a>——查看JVM已加载的类信息</li>
<li><a class="reference internal" href="sm.html"><span class="doc">sm</span></a>——查看已加载类的方法信息</li>
<li><a class="reference internal" href="dump.html"><span class="doc">dump</span></a>——dump 已加载类的 byte code 到特定目录</li>
<li><a class="reference internal" href="redefine.html"><span class="doc">redefine</span></a>——加载外部的<code class="docutils literal notranslate"><span class="pre">.class</span></code>文件，redefine到JVM里</li>
<li><a class="reference internal" href="jad.html"><span class="doc">jad</span></a>——反编译指定已加载类的源码</li>
<li><a class="reference internal" href="classloader.html"><span class="doc">classloader</span></a>——查看classloader的继承树，urls，类加载信息，使用classloader去getResource</li>
</ul>
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<span id="monitor-watch-trace"></span><h2>monitor/watch/trace相关<a class="headerlink" href="#monitor-watch-trace" title="永久链接至标题">¶</a></h2>
<blockquote>
<div>请注意，这些命令，都通过字节码增强技术来实现的，会在指定类的方法中插入一些切面来实现数据统计和观测，因此在线上、预发使用时，请尽量明确需要观测的类、方法以及条件，诊断结束要执行 <code class="docutils literal notranslate"><span class="pre">shutdown</span></code> 或将增强过的类执行 <code class="docutils literal notranslate"><span class="pre">reset</span></code> 命令。</div></blockquote>
<ul class="simple">
<li><a class="reference internal" href="monitor.html"><span class="doc">monitor</span></a>——方法执行监控</li>
<li><a class="reference internal" href="watch.html"><span class="doc">watch</span></a>——方法执行数据观测</li>
<li><a class="reference internal" href="trace.html"><span class="doc">trace</span></a>——方法内部调用路径，并输出方法路径上的每个节点上耗时</li>
<li><a class="reference internal" href="stack.html"><span class="doc">stack</span></a>——输出当前方法被调用的调用路径</li>
<li><a class="reference internal" href="tt.html"><span class="doc">tt</span></a>——方法执行数据的时空隧道，记录下指定方法每次调用的入参和返回信息，并能对这些不同的时间下调用进行观测</li>
</ul>
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<div class="section" id="options">
<span id="options"></span><h2>options<a class="headerlink" href="#options" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="options.html"><span class="doc">options</span></a>——查看或设置Arthas全局开关</li>
</ul>
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<div class="section" id="">
<span id="id3"></span><h2>管道<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<p>Arthas支持使用管道对上述命令的结果进行进一步的处理，如<code class="docutils literal notranslate"><span class="pre">sm</span> <span class="pre">org.apache.log4j.Logger</span> <span class="pre">|</span> <span class="pre">grep</span> <span class="pre"><init></span></code></p>
<ul class="simple">
<li>grep——搜索满足条件的结果</li>
<li>plaintext——将命令的结果去除颜色</li>
<li>wc——按行统计输出结果</li>
</ul>
</div>
<div class="section" id="">
<span id="id4"></span><h2>后台异步任务<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<p>当线上出现偶发的问题，比如需要watch某个条件，而这个条件一天可能才会出现一次时，异步后台任务就派上用场了，详情请参考<a class="reference internal" href="async.html"><span class="doc">这里</span></a></p>
<ul class="simple">
<li>使用 > 将结果重写向到日志文件，使用 & 指定命令是后台运行，session断开不影响任务执行（生命周期默认为1天）</li>
<li>jobs——列出所有job</li>
<li>kill——强制终止任务</li>
<li>fg——将暂停的任务拉到前台执行</li>
<li>bg——将暂停的任务放到后台执行</li>
</ul>
</div>
<div class="section" id="">
<span id="id5"></span><h2>其他特性<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="async.html">异步命令支持</a></li>
<li class="toctree-l1"><a class="reference internal" href="save-log.html">执行结果存日志</a></li>
<li class="toctree-l1"><a class="reference internal" href="batch-support.html">批处理的支持</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">ognl表达式的用法说明</a></li>
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