How to run logcat on multiple devices?

by

Use the -s option of adb:

adb -s <serialnumber>

Example

C:\Users\lel>adb devices
List of devices attached
192.168.198.101:5555    device
0123456789ABCDEF        device

adb -s 0123456789ABCDEF logcat
adb -s 192.168.198.101:5555 logcat

You can combine grep whit this, to get all lines that contain it.
an example is with System.out

Example:

 adb -s 192.168.198.101:5555 logcat | grep "System.out"

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