Basic finger with Lua and Luasocket.

finger.lua

$ lua
Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio
> local socket = require("socket")
> client = socket.tcp()
> client:connect("mit.edu", 79)
> client:send("\r\n")
> print(client:receive("*a"))
Student data loaded as of Mar 24, Staff data loaded as of Mar 24.

Notify Personnel or use WebSIS as appropriate to change your information.

Our on-line help system describes
  How to change data, how the directory works, where to get more info.
  For a listing of help topics, enter finger help@mit.edu. Try finger
  help_about@mit.edu to read about how the directory works.
  Directory bluepages may be found at http://mit.edu/communications/bp.

Did not understand query.
        nil     nil     2.3126602172852e-05