[Alex_Obando]

Hello, How I can do this:


If the server detects the name "Alex_Obando" and the player does /a then send the message "Alex_Obando is online"

Example:

Online Players: Alex_Obando & Mark_Weint.

Mark used the command /a
Alex_Obando is online.

Alex_Obando has left the server.
Mark used the command /a

Sorry Alex_Obando is not online.