Understanding adb logcat and how to filter from a example

Question

I am using Android's adb logcat for my React Native development. This is a sample of what is outputted by adb logcat:

03-19 16:47:01.168 14818 15029 I ReactNativeJS: inside f1
03-19 16:47:01.198 14818 15029 I ReactNativeJS: inside swe_rise_trans of index.js
03-19 16:47:01.218 14818 15030 D THIS IS MY TAG: HELLO WORLD
03-19 16:47:01.398 14818 15029 I ReactNativeJS: 'temp', 2444663.426169321
03-19 16:47:01.508 14818 15029 I ReactNativeJS: 'julday_of_sunrise_before_birth', 2444663.426169321

The first 2 columns are date and time....what about 3rd (14818) and 4th (15029) and 5th (I for some and D for some)??

The 6th is the Tag is it???

I have tried filtering this by doing:

adb logcat -s "THIS IS MY TAG"

instead of just adb logcat but when I filter with the above code I only get:

--------- beginning of main
--------- beginning of system

I would like to show all ouput with "THIS IS MY TAG" and "ReactNativeJS" only since the rest are just unnecessary noises....below is the complete adb logcat I had:

03-19 16:47:00.748  1334  1334 D StatusBar.NetworkController: refreshNwBoosterIndicator - setNWBoosterIndicators(false)
03-19 16:47:00.748  1334  1334 D StatusBar.NetworkController: refreshNwBoosterIndicator - setNWBoosterIndicators(false)
03-19 16:47:00.748  1334  1334 D StatusBar.NetworkController: refreshNwBoosterIndicator - setNWBoosterIndicators(false)
03-19 16:47:00.748  1334  1334 D StatusBar.NetworkController: refreshNwBoosterIndicator - setNWBoosterIndicators(false)
03-19 16:47:00.908 14818 15029 I ReactNativeJS: 'julday', 2444664.3090046295
03-19 16:47:00.968 14818 15029 I ReactNativeJS: 'next', 2444664.3090046295
03-19 16:47:01.058   340   810 V audio_hw_primary: out_standby: enter: usecase(1: low-latency-playback)
03-19 16:47:01.108   340   810 V audio_hw_primary: stop_output_stream: enter: usecase(1: low-latency-playback)
03-19 16:47:01.108   340   810 V audio_hw_primary: disable_audio_route: enter: usecase(1)
03-19 16:47:01.108   340   810 V audio_hw_primary: disable_audio_route: reset mixer path: low-latency-playback
03-19 16:47:01.108   340   810 D audio_route: ++++ audio_route_update_mixer ==============
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: SLIMBUS_0_RX Audio Mixer MultiMedia5
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: value: 0
03-19 16:47:01.108   340   810 D audio_route: ------ audio_route_update_mixer ==============
03-19 16:47:01.108   340   810 V audio_hw_primary: disable_audio_route: exit
03-19 16:47:01.108   340   810 V audio_hw_primary: disable_snd_device: snd_device(2: speaker)
03-19 16:47:01.108   340   810 D audio_route: ++++ audio_route_update_mixer ==============
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: SPK DRV Volume
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: value: 0
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: RX7 Digital Volume
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: value: 0
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: COMP0 Switch
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: value: 0
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: RX7 MIX1 INP1, value: 0
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: DAC1 Switch
03-19 16:47:01.108   340   810 D audio_route: Setting mixer control: value: 0
03-19 16:47:01.108   340   810 D audio_route: ------ audio_route_update_mixer ==============
03-19 16:47:01.108   340   810 V audio_hw_primary: stop_output_stream: exit: status(0)
03-19 16:47:01.108   340   810 V audio_hw_primary: out_standby: exit
03-19 16:47:01.168 14818 15029 I ReactNativeJS: inside f1
03-19 16:47:01.198 14818 15029 I ReactNativeJS: inside swe_rise_trans of index.js
03-19 16:47:01.218 14818 15030 D THIS IS MY TAG: HELLO WORLD
03-19 16:47:01.398 14818 15029 I ReactNativeJS: 'temp', 2444663.426169321
03-19 16:47:01.508 14818 15029 I ReactNativeJS: 'julday_of_sunrise_before_birth', 2444663.426169321

https://stackoverflow.com/q/30247308/1778421 – Alex P. Mar 19 '20 at 17:43 — Alex P., Mar 19 '20 at 17:43

score 1 · Answer 1 · answered Mar 19 '20 at 09:27

This is what I've figured out.... If you change your tag into a tag without spaces like "MYTAG" instead of "THIS IS MY TAG" then you can do the following command and it will only show the ReactNative messages and "MYTAG" messages:

adb logcat *:S ReactNative:V ReactNativeJS:V MYTAG

here is the example output from my end:

03-19 17:22:42.518 27224 27482 D MYTAG   : HELLO WORLD
03-19 17:22:42.798 27224 27481 I ReactNativeJS: 'temp', 2444663.426169321
03-19 17:22:42.908 27224 27481 I ReactNativeJS: 'julday_of_sunrise_before_birth', 2444663.426169321

If it is a Tag name that has spaces in between then I'm not too sure how to do it...maybe someone who knows can share how to do that?

Understanding adb logcat and how to filter from a example

1 Answers1