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