arthas/tutorials/katacoda/command-options-cn/options.md

全局开关

名称	默认值	描述
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！
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
batch-re-transform	true	是否支持批量对匹配到的类执行retransform操作
json-format	false	是否支持json化的输出
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
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
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
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
print-parent-fields	true	是否打印在parent class里的filed

查看所有的options

options{{execute T2}}

$ options
 LEVEL  TYPE  NAME         VALUE  SUMMARY             DESCRIPTION
--------------------------------------------------------------------------------------------
 0      bool  unsafe       false  Option to support   This option enables to proxy function
        ean                       system-level class  ality of JVM classes. Due to serious
                                                      security risk a JVM crash is possibly
                                                       be introduced. Do not activate it un
                                                      less you are able to manage.
 1      bool  dump         false  Option to dump the  This option enables the enhanced clas
        ean                        enhanced classes   ses to be dumped to external file for
                                                       further de-compilation and analysis.
 1      bool  batch-re-tr  true   Option to support   This options enables to reTransform c
        ean   ansform             batch reTransform   lasses with batch mode.
                                  Class
 2      bool  json-format  false  Option to support   This option enables to format object
        ean                       JSON format of obj  output with JSON when -x option selec
                                  ect output          ted.
 1      bool  disable-sub  false  Option to control   This option disable to include sub cl
        ean   -class              include sub class   ass when matching class.
                                  when class matchin
                                  g
 1      bool  save-result  false  Option to print co  This option enables to save each comm
        ean                       mmand's result to   and's result to log file, which path
                                  log file            is ${user.home}/logs/arthas-cache/res
                                                      ult.log.
 2      Stri  job-timeout  1d     Option to job time  This option setting job timeout,The u
        ng                        out                 nit can be d, h, m, s for day, hour,
                                                      minute, second. 1d is one day in defa
                                                      ult
 1      bool  print-paren  true   Option to print al  This option enables print files in pa
        ean   t-fields            l fileds in parent  rent class, default value true.
                                   class

获取option的值

options json-format{{execute T2}}

$ options json-format
 LEVEL  TYPE  NAME         VALUE  SUMMARY             DESCRIPTION
--------------------------------------------------------------------------------------------
 2      bool  json-format  false  Option to support   This option enables to format object
        ean                       JSON format of obj  output with JSON when -x option selec
                                  ect output          ted.

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。

设置指定的option

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：

cat /root/logs/arthas-cache/result.log{{execute T2}}

输入如下命令即可激活记录日志功能：

options save-result true{{execute T2}}

$ options save-result true                                                                                         
 NAME         BEFORE-VALUE  AFTER-VALUE                                                                            
----------------------------------------                                                                           
 save-result  false         true

稍候片刻，再次查看，发现出现记录：

cat /root/logs/arthas-cache/result.log{{execute T2}}

$ cat /root/logs/arthas-cache/result.log
2020-07-26 04:27:08 [arthas-command-execute] INFO  result -
2020-07-26 04:27:08 [arthas-command-execute] INFO  result -