Taking logcat and kernel logs simultaneously

Question

I am trying to take logs (logcat and kmsg) via the following command

"logcat -v time -f /dev/kmsg | cat /proc/"

However I am not sure, where the log file is stored, and what will be its name. How do I identify it

Answer 1

Here is logcat option for getting kernel logs too

adb logcat -b all

Answer 2

OK, here are the results of a quick Google search:

• Android Logging System
• How to get kernel messages from Android?

What I got from those links are:

1. The last part of your command should actually be cat /proc/kmsg
2. logcat -v time -f /dev/kmsg writes logcat outputs to kernel message buffer

So,

logcat -v time -f /dev/kmsg | cat /proc/kmsg

will output both logcat and kernel logs to stdout (whatever it is). Probably, you may write the output to a file as follows:

logcat -v time -f /dev/kmsg | cat /proc/kmsg > /sdcard/log.txt

The above worked from adb shell prompt on a rooted Android 4.4.2 device.

Hope this helps.