How can i create a command like this?

[darkcort]

Hello i realize in my server global (12.64) it no have the command /attr pos i remember in older version like 8.60 with that command you can use it on a magic forfield that when you walk on it it teleports you to the coordinates that you had placed with that command. So how can I create a command to do this function
If you can help me I would appreciate it very much.