logcat

Dump a log of system messages, including stack traces when an error occurred, and information messages logged by applications. More information: https://developer.android.com/studio/command-line/logcat.

• Display system logs:
  logcat
• Write system logs to a file:
  logcat -f {{path/to/file}}
• Display lines that match a regular expression:
  logcat --regex {{regular_expression}}
• Display logs for a specific PID:
  logcat --pid={{pid}}
• Display logs for the process of a specific package:
  logcat --pid=$(pidof -s {{package}})