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add en reset.md. #51
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reset
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===
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> Reset all classes that have been enhanced by Arthas, and all enhanced classes will be reset when Arthas server `shutdown`.
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### Usage
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```
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$ reset -h
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USAGE:
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reset [-h] [-E] [class-pattern]
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SUMMARY:
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Reset all the enhanced classes
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EXAMPLES:
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reset
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reset *List
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reset -E .*List
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OPTIONS:
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-h, --help this help
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-E, --regex Enable regular expression to match (wildcard matching by default)
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<class-pattern> Path and classname of Pattern Matching
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```
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### Reset specified class
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```
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$ trace Test test
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 57 ms.
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`---ts=2017-10-26 17:10:33;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc
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`---[0.590102ms] Test:test()
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`---ts=2017-10-26 17:10:34;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc
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`---[0.068692ms] Test:test()
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$ reset Test
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Affect(class-cnt:1 , method-cnt:0) cost in 11 ms.
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```
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### Reset all classes
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```
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$ trace Test test
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 15 ms.
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`---ts=2017-10-26 17:12:06;thread_name=main;id=1;is_daemon=false;priority=5;TCCL=sun.misc.Launcher$AppClassLoader@14dad5dc
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`---[0.128518ms] Test:test()
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$ reset
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Affect(class-cnt:1 , method-cnt:0) cost in 9 ms.
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```
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