open (FILE,"<file")
  || die "Could not open file : $!\n";

@contents = <FILE>;
$head = shift(@contents);
close(FILE);

$new_entry = 'Welcome to www.perlmonks.org'; 

open (FILE, ">file")
  || die "Could not open file : $!\n";


unshift (@contents,$head,$new_entry);
print FILE "@contents\n";
close(FILE);