GNU/Linux Desktop Survival Guide by Graham Williams
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ADB Find Files on the Device

20200214

$ adb shell
herolte:/ $ find / -name '*.mp3' 2>/dev/null
./system/media/audio/notifications/NETPHONEMESSAGEALERT.mp3
./system/media/audio/ringtones/Globeringtone.mp3
./system/media/audio/ringtones/NETPHONERINGTONE.mp3
./system/csc/GLB/system/media/audio/ringtones/Globeringtone.mp3
...
./storage/8912-4FA8/Music/...
...

There will be areas on the phone that are not accessible. The redirection of stderr to the null device ignores messages that report the lack of permissions.