perl script to automate any modules.

Hello friends,
I need help to automate verilog modules.
Suppose i have verilog modules
ax.v, bx.v, cx.v, dx.v ---------- individual modules,
ab.v ----------------- contains instantes of ax.v,bx.v
cd.v ----------------- contains instances of cx.v,dx.v
abcd.v -------- top-level module contains instances of ab.v, cd.v

How to write perl scripts inorder to automate running all this types of modules at a time.

Thanks
Raghavendra