I have a folder which is having 1200 files,all the file names are have maximum of 8 character length.I need to remove last character from each of the filnames and prefix it with character "A"

[perladdict]

Hi Monks, Below is the code i am trying to list the filnames in a directory

#!/usr/bin/perl
$dir = "C:\\Users\\user\\Desktop\\test";
opendir DIR, $dir or die "error: cannot open directory \"$dir\" $!";

@files = sort grep (!/^\.$|^\.\.$/, readdir(DIR));
closedir (DIR);
print "@files\n";

Once after listing all the filenames, i need validate each of the filenames should note exceed 8 characters. If files names which is having 8 characters and less than 8 characters i need to remove last charecter from each of the file names and prefix it with character "A"
All the filenames having .doc extention,below are the sample files names in a folder.

PBILLSTA.doc
PBGISCTX.doc
BGISCTXL.doc
P537_LC.doc
AODG.doc
MAD004PN.doc

Please advice me, which perl fucntion i need to use in order to remove last charecters from the filename if it is having 8 characters and prefix the filename with character "A"
For the filenames which is having less than 8 charecters i just need to prefix "A" to each without removing last character.