files described by RFC 1497 (tag 18).
arguments are specified, then
compiles the extension files for only those clients.
Sets the current directory used by
while creating extension files. This is useful when the
extension file names are specified as relative pathnames, and
needs to use the same current directory as the TFTP server
variable that controls the amount of debugging messages generated.
For example, -d4 or -d 4 will set the debugging level to 4.
Set the name of the config file that specifies the option
data to be sent to each client.