display / use useraccount

[adval40]

I want show and use the users (useraccount name) in a LUA script

2017-05-29 15:59:02.936 2017-05-29 15:59:02.936 User: ad initiated a switch command (10/Trap Blauw/On)
2017-05-29 15:59:02.937 (GPIO poorten) Lighting 1 (Trap Blauw)

in this log User Ad

has anyone an example

thanks in advance
Ad