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/tools/logcat.

Display system logs:

logcat

Write system logs to a [f]ile:

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}})