Question : Perl script to Copy Files from Mapped Drive to another drive on same Server.

Hi ,
Iam trying to copy files from Mapped Drive U to another Drive D: on DSame Server.
U drive has sub folders .  Target location  Drive: D:\x\y\z\
My script is looping through one file (list of files i need to copy from U: to D:\x\y\z).
Files inside list has complete path for each files.
for example . Suppose my file is 1.txt it has 3 files listed
1.pdf
/a/b/2.pdf
/a/3.pdf
..
l am looping through this file and copy from U drive if that file exist .
my script is runing fine if i run it from DOS  ny executing command perl