It's worth noting that in Perl the 'or' and 'and' operators are not equivalent to || and &&. For instance, they have super low operator precedence:

  my $variable = 0 or 1;

Would result in $variable == 0 because it really looks like this:

  (my $variable = 0) or 1;

I allowed myself to get burned by this once because I didn't read the fine print. ^^;;