$dirtoget = "/tmp/invs";
opendir(FILEDIR, $dirtoget) || die ("Cannot open $dirtoget");
@thefiles = grep -T, <$dirtoget/*>;  #Store the filenames into an array
closedir(FILEDIR);

#Calling another perl script that takes each filename as argument 
#and splits the file into multiple files for further processing

foreach $file (@thefiles) {    
@split_files = `perl split_invs.pl $file`) || next;  
chomp(@split_files);

$temp = join(" ", @split_files); 
`/tmp/get_acct_info.sh $temp`;  #This script takes each split file and reads some information & 
				#outputs the info to the file output_acct_list.out


#Load the main accounts file into a hash to compare against another file 
#and output accounts only in output_accts_list

$origaccts = "/tmp/main_accounts.txt";
open(FILEHANDLE, $origaccts) || die ("Cannot open $origaccts");
%lookup = map {chomp; $_ => undef} <FILEHANDLE>;
close(FILEHANDLE);

$acctlist = "/tmp/output_acct_list.out"; #Open the file output_acct_list for reading
open(ACCTLISTFILE, $banlist) || die ("Cannot open $acctlist");

#Output file that will contain filename of the bills that should be loaded into our system
open($output, '>', '/tmp/invs_load.txt') || 
die ("Cannot open output file /tmp/invs_load.txt");

while ($line = <ACCTLISTFILE>){
  chomp $line;
  ($filename, undef, undef, undef, $account) = split /\t/, $line;
  next if exists $lookup{$account};
  print $output "$filename\n";   #Print the filename of bills to be loaded to invs_load.txt
}

<Here I want to retrieve the filenames from the above file and append these files (in order) into a single file prior to loading it into our system> 

	}