readdir function is good way to go ahead. Here is sample code you can use and modify as per your requirement

sub findfile
{

my $searchfile= shift;
my $pathofbasedir= shift;

opendir DIR,"pathofbasedir";
my @usefulfiles = grep{!/^\.{1,2}$/} readdir DIR;
my @fileswithfullpath= map{$basepath."/".$_}@usefulfiles;
closedir(DIR);

foreach my $file (@fileswithfullpath)
{
  if(-d $file)
    {
    findfile($searchfile,$file)
    }
  else
    {
    if( $file =~ /$searchfile/)
    {
       print "FIle exists at ",$file;
       exit(1);
    }
    
    }

    
 }


}
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