Thanks everyone. I have another related question. Is it possible to randomly generate char within a certain range? For example if i want to generate two random chars between "aa" and "ff" so that the output will be like

ab 
ad
df
ca
.
.
.
[download]

PS. this is not a homework assignment. I finished college long ago. I just learn new tools to help me do my job and Perl is the mother of all tools.