Linux

In a source directory, i have 200 files those files i have to rename using linux script(for loop) as below formate, this script needs to run daily 

Eg:1 

Actual file name : abcd.071220.dat

Rename files like : Apple_abcd_071220.dat

Eg:2

Actual file name : xyz.071220.dat

Rename files like : Apple_xyz_071220.dat