如何查看自己的CPU是 64 还是32位的？( how to determin a cpu is 32 or 64 bit? )

参考： http://stackoverflow.com/questions/246007/how-to-determine-whether-a-given-linux-is-32-bit-or-64-bit

1. $ uname -m

x86_64 ==> 64-bit kernel
i686   ==> 32-bit kernel

2. $ lscpu

3. $ grep flag /proc/cpuinfo ， 具有： lm ==> 64-bit processor 就是 64位的啦