Little endian and Big endian

int checkCPU()
{
　{
　　 union u
　　 {
　　　 int a;
　　　 char b;
　　 } c;
　　 c.a = 1;
　　 return (c.b == 1);
　 }
}

$ echo I | tr -d [:space:] | od -to2 | head -n1 | awk '{print $2}' | cut -c6

perl -MConfig -e 'print "$Config{byteorder}\n";'

参考资料

http://www.cppblog.com/goolds/archive/2011/11/21/160618.html
http://serverfault.com/questions/163487/linux-how-to-tell-if-system-is-big-endian-or-little-endian
http://stackoverflow.com/questions/2610849/finding-if-the-system-is-little-endian-or-big-endian-with-perl

XTao