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Print the logger information, update the logger level
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### Usage
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#### Print the logger information
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`logger`{{execute T2}}
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```bash
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[arthas@2062]$ logger
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level INFO
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effectiveLevel INFO
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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```
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#### View logger information for the special name
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`logger -n org.springframework.web`{{execute T2}}
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```bash
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[arthas@2062]$ logger -n org.springframework.web
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name org.springframework.web
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel INFO
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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```
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Please write down your classLoaderHash here, in the case here, it's `2a139a55`. It will be used in the future steps.
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Note: Please replace `<classLoaderHash>` with your classLoaderHash above, then execute the commands manually in the following steps:
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#### View logger information for the special classloader
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`logger -c <classLoaderHash>`
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```bash
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[arthas@2062]$ logger -c 2a139a55
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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```
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#### Update logger level
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`logger --name ROOT --level debug`{{execute T2}}
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```bash
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[arthas@2062]$ logger --name ROOT --level debug
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update logger level success.
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```
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#### 指定classloader更新 logger level
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默认情况下，logger命令会在SystemClassloader下执行，如果应用是传统的`war`应用，或者spring boot fat jar启动的应用，那么需要指定classloader。
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可以先用 `sc -d yourClassName` 来查看具体的 classloader hashcode，然后在更新level时指定classloader：
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`logger -c <classLoaderHash> --name ROOT --level debug`
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```bash
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[arthas@2062]$ logger -c 2a139a55 --name ROOT --level debug
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```
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#### View the logger information without appenders
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By default, the `logger` command only prints information about the logger with appenders. If you want to see information about loggers without `appender`, you can use the parameter `--include-no-appender`.
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Note that the output will usually be very long.
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`logger --include-no-appender`{{execute T2}}
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```bash
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[arthas@2062]$ logger --include-no-appender
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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file app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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appenderRef [APPLICATION]
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name com
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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name com.alibaba
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher$AppClassLoader@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity true
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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...
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```
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