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3.5.5
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<h1>help<a class="headerlink" href="#help" title="永久链接至标题">¶</a></h1>
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<p>查看命令帮助信息，可以查看当前arthas版本支持的指令，或者查看具体指令的使用说明。</p>
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<blockquote>
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<div><p>[help 指令]的等同于[指令 -help]，都是查看具体指令的使用说明。</p>
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</div></blockquote>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right">不接参数</td>
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<td align="left">查询当前arthas版本支持的指令以及指令描述</td>
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</tr>
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<tr>
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<td align="right">[name:]</td>
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<td align="left">查询具体指令的使用说明</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="id2">
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<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<div class="highlight-default notranslate"><pre class="literal-block">$ help
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NAME DESCRIPTION
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help Display Arthas Help
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auth Authenticates the current session
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keymap Display all the available keymap for the specified connection.
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sc Search all the classes loaded by JVM
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sm Search the method of classes loaded by JVM
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classloader Show classloader info
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jad Decompile class
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getstatic Show the static field of a class
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monitor Monitor method execution statistics, e.g. total/success/failure count, average rt, fail rate, etc.
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stack Display the stack trace for the specified class and method
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thread Display thread info, thread stack
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trace Trace the execution time of specified method invocation.
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watch Display the input/output parameter, return object, and thrown exception of specified method invocation
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tt Time Tunnel
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jvm Display the target JVM information
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perfcounter Display the perf counter information.
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ognl Execute ognl expression.
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mc Memory compiler, compiles java files into bytecode and class files in memory.
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redefine Redefine classes. @see Instrumentation#redefineClasses(ClassDefinition...)
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retransform Retransform classes. @see Instrumentation#retransformClasses(Class...)
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dashboard Overview of target jvm's thread, memory, gc, vm, tomcat info.
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dump Dump class byte array from JVM
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heapdump Heap dump
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options View and change various Arthas options
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cls Clear the screen
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reset Reset all the enhanced classes
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version Display Arthas version
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session Display current session information
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sysprop Display, and change the system properties.
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sysenv Display the system env.
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vmoption Display, and update the vm diagnostic options.
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logger Print logger info, and update the logger level
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history Display command history
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cat Concatenate and print files
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base64 Encode and decode using Base64 representation
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echo write arguments to the standard output
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pwd Return working directory name
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mbean Display the mbean information
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grep grep command for pipes.
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tee tee command for pipes.
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profiler Async Profiler. https://github.com/jvm-profiling-tools/async-profiler
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stop Stop/Shutdown Arthas server and exit the console.
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</pre>
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</div>
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<div class="highlight-default notranslate"><pre class="literal-block"> $ help dashboard
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USAGE:
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dashboard [-h] [-i <value>] [-n <value>]
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SUMMARY:
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Overview of target jvm's thread, memory, gc, vm, tomcat info.
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EXAMPLES:
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dashboard
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dashboard -n 10
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dashboard -i 2000
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WIKI:
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https://arthas.aliyun.com/doc/dashboard
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OPTIONS:
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-h, --help this help
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-i, --interval <value> The interval (in ms) between two executions, default is 5000 ms.
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-n, --number-of-execution <value> The number of times this command will be executed.</pre>
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</div>
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