Mac command line

• Check mac version: sw_vers -productVersion 
• Change HostName: sudo scutil --set HostName nameyouwant
• Change hostname: sudo hostname mbpr

• To start an application from command line, TeamViewer for example:

       > open -g -a /Applications/TeamViewer.app

• To gracefully quit instead of kill-ing:

      > osascript -e 'quit app "TeamViewer.app"'

• Open multiple VLC
  /Applications/VLC.app/Contents/MacOS/VLC
• Restart from terminal: 
• sudo shutdown -r now 
• sudo shutdown -h +5 
• 
  

With details on hiding given by: https://support.apple.com/en-au/ht203998

pwpolicy can both disable and enable users, without losing their password

To disable the user

pwpolicy -u username disableuser

To enable the user

pwpolicy -u username enableuser

Use dscl to hide the user so they don't show on login:

sudo dscl . create /Users/username IsHidden 1 

To show a hidden user

sudo dscl . create /Users/username IsHidden 0