open FILE, "+< test.cfg" || die "Cannot open file\n" ;

##</code><code>##

open FILE, ("+< test.cfg" || die "Cannot open file\n") ;

##</code><code>##

open FILE, "+< test.cfg" or die "Cannot open file\n";

##</code><code>##

open my $fh, '+<', 'test.cfg" or die "Cannot open file: $!\n";