How to read files in all subfolders?

[coltman]

Dear all,

I have several hundreds of txt files to read. Unfortunately, they are stored under multiple sub-folders (could be several layers). How can I let PERL automatically search and read these files?

I have the following code. However, (1) it does not read through sub-folders and (2) it works only when I place the perl code under the same folder with the txt files. How can I modify my code to (1) read both root and sub-folders? and (2) specify the root folder rather than the default "dir"?

Any widsom will be greatly appreciated!

#=====file reading=============;
open(FIND, "dir *.txt /B |") || die "couldn't open: $!\n";
#============Text reading In Each File====================;
FILE:
while (<FIND>)
{
     m/(20\d\d)/;
    $filename=$1; 
    print "$filename\n"; 
    if (!open(TEXTFILE, $_)) {
        #print $_;
        print "Can't open $_--continuing...\n";
        next FILE;
        }
    
#============Article reading======================;
        
    while(<TEXTFILE>) {
        ......................................