The key statement for generating random numbers is
rand. By itself, it generates a fraction which is at least 0 and less than 1. Given a number, as in
rand(6), it generates an integer which is at least 0 and less than the number it was given (0 to 5 in this case).
For the example you've given with colors, the code would be:
my @colors = qw(red yellow green cyan blue magenta white gray black);
print $colors[rand @colors], "\n";
The first line makes a list of available choices and the second creates a number from 0 to (the number of options - 1), then prints the item at that position in the list. (List elements are numbered starting at 0 rather than 1, so this can produce any element in the list.)
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