Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

Loops - for

There are two loop formats: one for iterating numeric indexes and another one for working with iterators. See the following code:

   for x = 1,1337 do     print(x)   end

The step number (which can be negative) can be set by passing a third argument to the loop statement:

   for x = 1337,1,-1 do     print(x)   end

The output will be as follows:

   1337   1336   1335   …   1

For loops must end with the terminator keyword end.

The iterator function pairs() allows iteration through key and values of a given table:

   t = {}   t[“nmap”] = “FTW”   t[1337] = “b33r”   for index, value in pairs(t) do     print(index, value)   end

The preceding snippet will produce the following output:

   nmap, ftw   1337, b33r

The items returned by the iterator pairs() is not guaranteed ...