Answer by Jeroen Wiert Pluimers for How to stop and start dropbox.app in Apple Terminal?

In addition to the answer by slhck:

When the DropBox menu icon hangs and shows the rainbow wheel/spinning wheel then the below command will kill Dropbox:

killall Dropbox

Then you can start it with open -a "DropBox" like https://superuser.com/users/48078/slhck mentioned.

This is the alias I have defined for restarting Dropbox:

alias restartDropBox="osascript -e 'tell application \"Dropbox\" to quit';killall Dropbox;open -a \"Dropbox\""

Note the:

• \ to escape some double quotes
• chaining of commands through ; (not && as the first and second might fail)

NB: The 300% enlarged spinning wheel is from WikiMedia.