Lets say file 1 is:

foo
bar
... continues on for 100 lines

And file 2 is:

foo
baz
bar
... continues on exactly the same 100 lines as file 1

Would file 2 be different from file 1 from line 2 and down?  Or would it
be different for line 2 and 3?

Also, the keywords:

next; Brings you to the next iteration in a loop
last; leaves the loop

Should help you iterate through a while loop (or empty loop)

i.e.

{
  # this is a loop, just two sets of brackets
  # put a last statement and it will leave.
  # put one of these in your for loops, or outside of your for loops.
}

Also you can get tricky by naming loops, i.e.:

FOO:
{
  print "foo";
  BAR:
  {
    last FOO;
  }
  # anything below here never executes
  print "bar";
}


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