This is a RTFM question but I'll bite anyways.

File::Copy was mentioned before.

use File::Copy;

copy("oldfile", "newfile");
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So then all you need is the "dir". I noticed you are using system calls, that is unnecesary for these type of commands.

try the following

my @files = <some\\path\\here\\*>; 
#the * means all files in that directory
#just in case you were confused.
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finally to delete a file use the following

unlink($filename);
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If you want to set the context of your perl program to read from a particular directory without having to constantly put a $path + $filename then do the following

chdir($path) or die "foo error message\n";
#now do some foo with $filename in this directory
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you just got served lol