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2016/09/19 MacOSX

Tip 1: Change screenshot file type:

defaults write com.apple.screencapture type jpg

Tip 2: Encrypt and decrypt file using openssl:

openssl enc -aes-256-cbc -e -in {path-in} -out {path-out}
openssl enc -aes-256-cbc -d -in {path-in} -out {path-out}

Tip 3: Set updates check to daily (or any other value you would like)

defaults write com.apple.SoftwareUpdate ScheduleFrequency -int 1

Tip 4: Hold down option key when clicking on volume icon to quickly switch between audio input and output devices.

Tip 5: Prevent computer to sleep / install updates:

caffeinate -i -t 3600

Source:
https://www.youtube.com/watch?v=uI4x0wvogco
http://snazzylabs.com/tutorial/five-advanced-tricks-for-mac-users/