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> 全局开关
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| 名称 | 默认值 | 描述 |
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| ------------------ | ----- | ---------------------------------------- |
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| unsafe | false | 是否支持对系统级别的类进行增强，打开该开关可能导致把JVM搞挂，请慎重选择！ |
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| dump | false | 是否支持被增强了的类dump到外部文件中，如果打开开关，class文件会被dump到`/${application working dir}/arthas-class-dump/`目录下，具体位置详见控制台输出 |
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| batch-re-transform | true | 是否支持批量对匹配到的类执行retransform操作 |
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| json-format | false | 是否支持json化的输出 |
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| disable-sub-class | false | 是否禁用子类匹配，默认在匹配目标类的时候会默认匹配到其子类，如果想精确匹配，可以关闭此开关 |
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| support-default-method | true | 是否支持匹配到default method，默认会查找interface，匹配里面的default method。参考 [#1105](https://github.com/alibaba/arthas/issues/1105) |
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| save-result | false | 是否打开执行结果存日志功能，打开之后所有命令的运行结果都将保存到`~/logs/arthas-cache/result.log`中 |
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| job-timeout | 1d | 异步后台任务的默认超时时间，超过这个时间，任务自动停止；比如设置 1d, 2h, 3m, 25s，分别代表天、小时、分、秒 |
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| print-parent-fields | true | 是否打印在parent class里的filed |
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### 查看所有的options
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`options`{{execute T2}}
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```bash
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$ options
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LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION
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--------------------------------------------------------------------------------------------
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0 bool unsafe false Option to support This option enables to proxy function
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ean system-level class ality of JVM classes. Due to serious
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security risk a JVM crash is possibly
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be introduced. Do not activate it un
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less you are able to manage.
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1 bool dump false Option to dump the This option enables the enhanced clas
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ean enhanced classes ses to be dumped to external file for
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further de-compilation and analysis.
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1 bool batch-re-tr true Option to support This options enables to reTransform c
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ean ansform batch reTransform lasses with batch mode.
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Class
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2 bool json-format false Option to support This option enables to format object
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ean JSON format of obj output with JSON when -x option selec
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ect output ted.
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1 bool disable-sub false Option to control This option disable to include sub cl
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ean -class include sub class ass when matching class.
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when class matchin
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g
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1 bool save-result false Option to print co This option enables to save each comm
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ean mmand's result to and's result to log file, which path
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log file is ${user.home}/logs/arthas-cache/res
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ult.log.
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2 Stri job-timeout 1d Option to job time This option setting job timeout,The u
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ng out nit can be d, h, m, s for day, hour,
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minute, second. 1d is one day in defa
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ult
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1 bool print-paren true Option to print al This option enables print files in pa
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ean t-fields l fileds in parent rent class, default value true.
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class
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```
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### 获取option的值
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`options json-format`{{execute T2}}
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```
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$ options json-format
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LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION
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--------------------------------------------------------------------------------------------
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2 bool json-format false Option to support This option enables to format object
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ean JSON format of obj output with JSON when -x option selec
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ect output ted.
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```
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> 默认情况下`json-format`为false，如果希望`watch`/`tt`等命令结果以json格式输出，则可以设置`json-format`为true。
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### 设置指定的option
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例如，想打开执行结果存日志功能首先查看日志，发现无记录：
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`cat /root/logs/arthas-cache/result.log`{{execute T2}}
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输入如下命令即可激活记录日志功能：
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`options save-result true`{{execute T2}}
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```
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$ options save-result true
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NAME BEFORE-VALUE AFTER-VALUE
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----------------------------------------
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save-result false true
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```
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稍候片刻，再次查看，发现出现记录：
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`cat /root/logs/arthas-cache/result.log`{{execute T2}}
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```bash
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$ cat /root/logs/arthas-cache/result.log
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2020-07-26 04:27:08 [arthas-command-execute] INFO result -
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2020-07-26 04:27:08 [arthas-command-execute] INFO result -
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```
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