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3.3.4
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<li class="toctree-l1"><a class="reference external" href="https://alibaba.github.io/arthas/arthas-tutorials?language=en">Online tutorials(Recommend)</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#pipe">pipe</a></li>
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<li class="toctree-l3"><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">how to use ognl</a></li>
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<div class="section" id="advanced-usage">
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<h1>Advanced Usage<a class="headerlink" href="#advanced-usage" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="basic">
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<h2>Basic<a class="headerlink" href="#basic" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p>help - display Arthas help</p></li>
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<li><p>cls - clear the screen</p></li>
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<li><p><a class="reference internal" href="cat.html"><span class="doc">cat</span></a> - Concatenate and print files</p></li>
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<li><p><a class="reference internal" href="echo.html"><span class="doc">echo</span></a> - write arguments to the standard output</p></li>
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<li><p><a class="reference internal" href="grep.html"><span class="doc">grep</span></a> - Pattern searcher</p></li>
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<li><p><a class="reference internal" href="tee.html"><span class="doc">tee</span></a> - Copies standard input to standard output, making a copy in zero or more files.</p></li>
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<li><p><a class="reference internal" href="pwd.html"><span class="doc">pwd</span></a> - Return working directory name</p></li>
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<li><p>session - display current session information</p></li>
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<li><p><a class="reference internal" href="reset.html"><span class="doc">reset</span></a> - reset all the enhanced classes. All enhanced classes will also be reset when Arthas server is closed by <code class="docutils literal notranslate"><span class="pre">stop</span></code></p></li>
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<li><p>version - print the version for the Arthas attached to the current Java process</p></li>
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<li><p>history - view command history</p></li>
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<li><p>quit/exit - exit the current Arthas session, without effecting other sessions</p></li>
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<li><p>stop - terminate the Arthas server, all Arthas sessions will be destroyed</p></li>
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<li><p><a class="reference internal" href="keymap.html"><span class="doc">keymap</span></a> - keymap for Arthas keyboard shortcut</p></li>
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</ul>
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</div>
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<div class="section" id="jvm">
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<h2>JVM<a class="headerlink" href="#jvm" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p><a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a> - dashboard for the system’s real-time data</p></li>
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<li><p><a class="reference internal" href="thread.html"><span class="doc">thread</span></a> - show java thread information</p></li>
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<li><p><a class="reference internal" href="jvm.html"><span class="doc">jvm</span></a> - show JVM information</p></li>
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<li><p><a class="reference internal" href="sysprop.html"><span class="doc">sysprop</span></a> - view/modify system properties</p></li>
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<li><p><a class="reference internal" href="sysenv.html"><span class="doc">sysenv</span></a> — view system environment variables</p></li>
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<li><p><a class="reference internal" href="vmoption.html"><span class="doc">vmoption</span></a> - view/modify the vm diagnostic options.</p></li>
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<li><p><a class="reference internal" href="perfcounter.html"><span class="doc">perfcounter</span></a> - show JVM Perf Counter information</p></li>
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<li><p><a class="reference internal" href="logger.html"><span class="doc">logger</span></a> - print the logger information, update the logger level</p></li>
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<li><p><a class="reference internal" href="getstatic.html"><span class="doc">getstatic</span></a> - examine class’s static properties</p></li>
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<li><p><a class="reference internal" href="ognl.html"><span class="doc">ognl</span></a> - execute ongl expression</p></li>
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<li><p><a class="reference internal" href="mbean.html"><span class="doc">mbean</span></a> - show Mbean information</p></li>
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<li><p><a class="reference internal" href="heapdump.html"><span class="doc">heapdump</span></a> - dump java heap in hprof binary format, like <code class="docutils literal notranslate"><span class="pre">jmap</span></code></p></li>
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</ul>
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</div>
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<div class="section" id="class-classloader">
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<h2>class/classloader<a class="headerlink" href="#class-classloader" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p><a class="reference internal" href="sc.html"><span class="doc">sc</span></a> - check the info for the classes loaded by JVM</p></li>
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<li><p><a class="reference internal" href="sm.html"><span class="doc">sm</span></a> - check methods info for the loaded classes</p></li>
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<li><p><a class="reference internal" href="jad.html"><span class="doc">jad</span></a> - decompile the specified loaded classes</p></li>
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<li><p><a class="reference internal" href="mc.html"><span class="doc">mc</span></a> - Memory compiler, compiles <code class="docutils literal notranslate"><span class="pre">.java</span></code> files into <code class="docutils literal notranslate"><span class="pre">.class</span></code> files in memory</p></li>
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<li><p><a class="reference internal" href="redefine.html"><span class="doc">redefine</span></a> - load external <code class="docutils literal notranslate"><span class="pre">*.class</span></code> files and re-define it into JVM</p></li>
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<li><p><a class="reference internal" href="dump.html"><span class="doc">dump</span></a> - dump the loaded classes in byte code to the specified location</p></li>
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<li><p><a class="reference internal" href="classloader.html"><span class="doc">classloader</span></a> - check the inheritance structure, urls, class loading info for the specified class; using classloader to get the url of the resource e.g. <code class="docutils literal notranslate"><span class="pre">java/lang/String.class</span></code></p></li>
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</ul>
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</div>
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<div class="section" id="monitor-watch-trace-related">
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<h2>monitor/watch/trace - related<a class="headerlink" href="#monitor-watch-trace-related" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div><p><strong>Attention</strong>: commands here are taking advantage of byte-code-injection, which means we are injecting some <a class="reference external" href="https://en.wikipedia.org/wiki/Aspect-oriented_programming">aspects</a> into the current classes for monitoring and statistics purpose. Therefore, when using it for online troubleshooting in your production environment, you’d better <strong>explicitly specify</strong> classes/methods/criteria, and remember to remove the injected code by <code class="docutils literal notranslate"><span class="pre">stop</span></code> or <code class="docutils literal notranslate"><span class="pre">reset</span></code>.</p>
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</div></blockquote>
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<ul class="simple">
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<li><p><a class="reference internal" href="monitor.html"><span class="doc">monitor</span></a> - monitor method execution statistics</p></li>
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<li><p><a class="reference internal" href="watch.html"><span class="doc">watch</span></a> - display the input/output parameter, return object, and thrown exception of specified method invocation</p></li>
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<li><p><a class="reference internal" href="trace.html"><span class="doc">trace</span></a> - trace the execution time of specified method invocation</p></li>
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<li><p><a class="reference internal" href="stack.html"><span class="doc">stack</span></a> - display the stack trace for the specified class and method</p></li>
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<li><p><a class="reference internal" href="tt.html"><span class="doc">tt</span></a> - time tunnel, record the arguments and returned value for the methods and replay</p></li>
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</ul>
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</div>
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<div class="section" id="options">
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<h2>options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p><a class="reference internal" href="options.html"><span class="doc">options</span></a> - check/set Arthas global options</p></li>
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</ul>
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</div>
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<div class="section" id="profiler-flame-graph">
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<h2>profiler/flame graph<a class="headerlink" href="#profiler-flame-graph" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><p><a class="reference internal" href="profiler.html"><span class="doc">profiler</span></a> - use <a class="reference external" href="https://github.com/jvm-profiling-tools/async-profiler">async-profiler</a> to generate flame graph</p></li>
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</ul>
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</div>
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<div class="section" id="pipe">
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<h2>pipe<a class="headerlink" href="#pipe" title="Permalink to this headline">¶</a></h2>
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<p>Arthas provides <code class="docutils literal notranslate"><span class="pre">pipe</span></code> to process the result returned from commands further, e.g. <code class="docutils literal notranslate"><span class="pre">sm</span> <span class="pre">java.lang.String</span> <span class="pre">*</span> <span class="pre">|</span> <span class="pre">grep</span> <span class="pre">'index'</span></code>. Commands supported in <code class="docutils literal notranslate"><span class="pre">pipe</span></code>:</p>
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<ul class="simple">
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<li><p>grep - filter the result with the given keyword</p></li>
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<li><p>plaintext - remove the ANSI color</p></li>
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<li><p>wc - count lines</p></li>
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</ul>
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</div>
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<div class="section" id="async-in-background">
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<h2>async in background<a class="headerlink" href="#async-in-background" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="async.html"><span class="doc">async</span></a> can be handy when a problem is hardly to reproduce in the production environment, e.g. one <code class="docutils literal notranslate"><span class="pre">watch</span></code> condition may happen only once in one single day.</p>
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<ul class="simple">
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<li><p>job control - use <code class="docutils literal notranslate"><span class="pre">></span></code> to redirect result into the log file, use <code class="docutils literal notranslate"><span class="pre">&</span></code> to put the job to the background. Job keeps running even if the session is disconnected (the session lifecycle is 1 day by default)</p></li>
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<li><p>jobs - list all jobs</p></li>
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<li><p>kill - forcibly terminate the job</p></li>
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<li><p>fg - bring the suspend job to the foreground</p></li>
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<li><p>bg - put the job to run in the background</p></li>
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</ul>
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</div>
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<div class="section" id="web-console">
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<h2>Web Console<a class="headerlink" href="#web-console" title="Permalink to this headline">¶</a></h2>
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<p>Arthas supports living inside a browser. The communication between arthas and browser is via websocket.</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="web-console.html">Web Console</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="start-as-a-java-agent">
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<h2>Start as a Java Agent<a class="headerlink" href="#start-as-a-java-agent" title="Permalink to this headline">¶</a></h2>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="agent.html">Start as a Java Agent</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="user-data-report">
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<h2>User data report<a class="headerlink" href="#user-data-report" title="Permalink to this headline">¶</a></h2>
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<p>After the <code class="docutils literal notranslate"><span class="pre">3.1.4</span></code> version, arthas support user data report.</p>
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<p>At startup, use the <code class="docutils literal notranslate"><span class="pre">stat-url</span></code> option, such as: <code class="docutils literal notranslate"><span class="pre">./as.sh</span> <span class="pre">--stat-url</span> <span class="pre">'http://192.168.10.11:8080/api/stat'</span></code></p>
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<p>There is a sample data report in the tunnel server that users can implement on their own.</p>
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<p><a class="reference external" href="https://github.com/alibaba/arthas/blob/master/tunnel-server/src/main/java/com/alibaba/arthas/tunnel/server/app/web/StatController.java">StatController.java</a></p>
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</div>
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<div class="section" id="other-features">
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<h2>Other features<a class="headerlink" href="#other-features" title="Permalink to this headline">¶</a></h2>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="async.html">Async support</a></li>
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<li class="toctree-l1"><a class="reference internal" href="save-log.html">log the output</a></li>
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<li class="toctree-l1"><a class="reference internal" href="batch-support.html">batch</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">how to use ognl</a></li>
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</ul>
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</div>
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