search move and change

i wanted to write a perl script such that it can search and move all the .plx extension based file in the system to another location say(/usr/temp/dump) and the rename there .plx extension to .opx
i have tried writing it but with no success
i know that i can rename using the following command
rename 's/new$/old/' mah*.new

re: search move and change

same as other forums:

What have you tried?
Where are you stuck?
Post your code.