#To hide notification icon
* launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
* killall NotificationCenter
#To show notification icon
* launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
* Hit Command+Shift+G and go to /System/Library/CoreServices/
* find “Notification Center” and double-click it to launch it again