【鸿蒙南向开发】OpenHarmony——hilog命令行使用手册

为了让刚入门的鸿蒙开发者迅速掌握hilog工具的使用方法，特编写了该篇命令行使用手册供开发者查阅，让开发者在自己的的开发和调试的过程中充分认识hilog工具的优势和便捷。

一、查询日志

1.1、指定模块查询

-t 用于指定输出日志的类型/模块，目前系统共包含app/core/kmsg/init四种日志类型。

hilog -t app|core|kmsg|init 阻塞式实时查询模块日志，-t可以与其他参数一起使用。

hilog -t app|core|kmsg|init -x 非阻塞式实时查询模块日志，-x选项也可以和hilog的其他选项同时使用。

示例如下：

# hilog -t kmsg
01-01 00:00:03.909     0     0 I fffff/kmsg: Booting Linux on physical CPU 0x0
01-01 00:00:03.909     0     0 W fffff/kmsg: Linux version 5.10.79 (osm@ubuntu) (OHOS () clang version 10.0.1.480513  (llvm-project b2cadc87d64786377748bdb6bc5e6949492f01ab), GNU ld (Linaro_Binutils-2019.12) 2.28.2.20170706) #1 SMP Wed Apr 6 09:37:37 CST 2022
01-01 00:00:03.909     0     0 I fffff/[410fc075]: CPU: ARMv7 Processor  revision 5 (ARMv7), cr=10c5387d
01-01 00:00:03.909     0     0 I fffff/kmsg: CPU: div instructions available: patching division code
01-01 00:00:03.909     0     0 I fffff/kmsg: CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
01-01 00:00:03.909     0     0 I fffff/kmsg: OF: fdt: Machine model: Hisilicon HI3516DV300 DEMO Board
01-01 00:00:03.909     0     0 I fffff/kmsg: Memory policy: Data cache writealloc
01-01 00:00:03.909     0     0 D fffff/kmsg: cma: dma_contiguous_reserve(limit ffffffff)
01-01 00:00:03.909     0     0 D fffff/kmsg: cma: dma_contiguous_reserve: reserving 64 MiB for global area

1.2、指定tag查询

-T选项为指定tag。标签：用于指定日志标识，可以为任意字符串，建议标识调用所在的类或者业务行为。

hilog -t app|core|kmsg|init -T <tag> 模块内指定tag， -T可以与其他参数一起使用。

hilog -T <tag> 只指定tag

示例如下：

# hilog -t core -T BatteryThread

01-02 02:10:03.771   725   820 I 02500/BatteryThread: UpdateBatteryInfo: BatteryInfo capacity=11, voltage=4123456, temperature=222, healthState=1, pluggedType=2, pluggedMaxCurrent=-1, pluggedMaxVoltage=-1, chargeState=3, chargeCounter=4000000, present=0, technology=Li-ion
01-02 02:10:03.771   725   820 I 02500/BatteryThread: UpdateBatteryInfo g_callback is nullptr
01-02 02:10:03.771   725   820 I 02500/BatteryThread: LoopingThreadEntry: timeout=-1, nevents=1
01-02 02:10:13.772   725   820 I 02500/BatteryThread: UpdateBatteryInfo: BatteryInfo capacity=11, voltage=4123456, temperature=222, healthState=1, pluggedType=2, pluggedMaxCurrent=-1, pluggedMaxVoltage=-1, chargeState=3, chargeCounter=4000000, present=0, technology=Li-ion
01-02 02:10:13.772   725   820 I 02500/BatteryThread: UpdateBatteryInfo g_callback is nullptr
01-02 02:10:13.772   725   820 I 02500/BatteryThread: LoopingThreadEntry: timeout=-1, nevents=1
01-02 02:10:23.772   725   820 I 02500/BatteryThread: UpdateBatteryInfo: BatteryInfo capacity=11, voltage=4123456, 

# hilog -T BatteryThread

01-02 02:14:03.771   725   820 I 02500/BatteryThread: UpdateBatteryInfo: BatteryInfo capacity=11, voltage=4123456, temperature=222, healthState=1, pluggedType=2, pluggedMaxCurrent=-1, pluggedMaxVoltage=-1, chargeState=3, chargeCounter=4000000, present=0, technology=Li-ion
01-02 02:14:03.771   725   820 I 02500/BatteryThread: UpdateBatteryInfo g_callback is nullptr
01-02 02:14:03.771   725   820 I 02500/BatteryThread: LoopingThreadEntry: timeout=-1, nevents=1
01-02 02:14:13.772   725   820 I 02500/BatteryThread: UpdateBatteryInfo: BatteryInfo capacity=11, voltage=4123456, temperature=222, healthState=1, pluggedType=2, pluggedMaxCurrent=-1, pluggedMaxVoltage=-1, chargeState=3, chargeCounter=4000000, present=0, technology=Li-ion

1.3、指定level查询

-L 指定日志级别，HiLog中定义了DEBUG、INFO、WARN、ERROR、FATAL五种日志级别。

hilog -t app|core|kmsg|init -L D|I|W|E|F 模块内指定level查询，D:debug, I:info, W:warning, E:error, F:fatal。

hilog -L D|I|W|E|F 只指定level查询，可以与其他参数一起使用

示例如下：

# hilog -t app -L I

01-01 08:15:00.030   875   875 I 02200/JsApp: SystemUI_Default tag: TimeManager --> notifyTimeChange
01-01 08:15:00.031   875   875 I 02200/JsApp: SystemUI_Default tag: EventManager --> publish localEvent type: Time_Change_Event
01-01 08:16:00.031   875   875 I 02200/JsApp: SystemUI_Default tag: CommonEvent_TimeManager --> handle common event: usual.event.TIME_TICK
01-01 08:16:00.031   875   875 I 02200/JsApp: SystemUI_Default tag: TimeManager --> notifyTimeChange
01-01 08:16: