in reply to How can I programatically determine the Endian-ness of the CPU?

In addition to checking Config as suggested by grep, you can use a solution provided by perlport. To quote:
If you need to distinguish between endian architectures you could use either of the variables set like so:
$is_big_endian = unpack("h*", pack("s", 1)) =~ /01/; $is_little_endian = unpack("h*", pack("s", 1)) =~ /^1/;