Hi,
@rulefiles is an array containing the names of the *.rule" files in the folder.
for my $rulefile (@rulefiles) {
# ...
}
is a loop that goes over each of the items (file names) in the
@rulefiles array, one after the other, assigns it to the
$rulefile variable, so that each of the items can be manipulated with the
$rulefile variable name within the body of the loop.
This is a simple example of a Perl one-liner using a similar construct:
$ perl -e 'for my $i (1, 4, 3, 2) {
print "$i\n";
}'
1
4
3
2
$
In this example, the
$i variable takes successively each value of the list
(1, 4, 3, 2) and the body of the loop simply prints
$i to the screen.