You will want to learn about "loops" and other control structures.

The basic idea is that for each URL in your list, you execute a block of code which fetches the page.

Also, you will likely want to learn about strings and interpolating. '@lines' is just a string containing the at-sign and the word "lines". @lines (without the quotes) is the list of the elements contained in the array with the name lines, which is highly more likely to be what you want.