need to get the values and mail

sorry, I don't understand the question... what mail? this is only a list of files. If you use a list in a scalar context you will get the number of elements

my $dirname = "/home/oracle/test/Oracle/oradata"; 
opendir (my $DIR, $dirname ); 
my $num_of_files = () = readdir $DIR;
print "Found ", ($num_of_files - 2), " files in the dir $dirname\n";
closedir $DIR;
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Updated: don't add ".." and "." to the sum