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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