Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

Reading a file

To read a file using an explicit file descriptor, use the function io.read:

   file = io.open(filename)   val = file:io.read("%d")

There is a function named io.lines that will take a filename as an argument and return an iterator to traverse each line of the filename. This function can help us process files in chunks divided into new lines:

for line in io.lines(filename) do  if string.match(line, "<password>(.*)</password>") then    … --Do something here  endend