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/;

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In reply to Re: How can I programatically determine the Endian-ness of the CPU? by wog
in thread How can I programatically determine the Endian-ness of the CPU? by ton

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