How do I mute the startup chime on a modern Mac?
61615
Disable Mac startup sound
17634
How do you turn off Bluetooth on startup using MacBook Air and macOS Sierra?
137417
iPhone - Is it possible to override silent mode or have a recursive alert sound with push notification?
47178
How do I turn off audio echo from microphone to local speakers?
80918
Disabling sound output devices (e.g. Internal Speakers) in OS X
132102
How can I disable the notification sounds while playing music?
25177
Disable AirPlay on a Mac
152918
Keyboard macro to change default audio device
126995
How to programmatically prevent a Mac from going to sleep?
21714
How can I stop being prompted to unlock the 'default' keyring on boot?
39283
Prevent "Resume" for my Cocoa application?
138520
How to disable system beep for non-privileged user
88151
How to turn off Facebook notifications on Mac OS X?
64845
Is there a command like "watch" or "inotifywait" on the Mac?
139473
How do configure Skype For Business to not start when macOS starts?
27308
How can I change the default audio device from command line?
87561
How do I individually mute audio per tab in Chrome or Firefox?