Ftp.currentdir read/write property
The Ftp.currentdir property gets or sets the current directory on the FTP server as a string.
Returns nil if the value could not be retrieved (get more information with the net.error property).
Example
local net = require "net"
local url = "your ftp server address"
local ftpclient = net.Ftp(url, "anonymous", "guest")
-- outputs ftp port
print("ftp port = "..ftpclient.port)