#!/opt/perl5/current/bin/perl

chdir "/tmp/test";

$CONFIG = "some_string_with_no_filename_wildcards";

@files = glob("$CONFIG");

foreach $file (@files) {
    next unless -e $file;
    print "$file \n";
}

##</code><code>##

foreach $file ( grep {-e} @files ) {
    print "$file\n";
}

##</code><code>##

@files = ( $CONFIG =~ /[*?]/ ) ? glob( $CONFIG ) : ( -e $CONFIG ) ? ( $CONFIG ) : ();