Suggestion #1945

Hello EC , i was thinking lately that why don't the server have a command to check if a player is online or not ? For example , when u join Creative & don't find your friend online , u just keep joining other servers to check if he is on and that takes lot of time , and u maybe can't find him online either.
i hope u guys add this command , i dunno what is it gonna be but i hope so.
Have a Nice day