如果有x86_64就是64位的，没有就是32位的
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| vincent@ubuntu:~$ uname -a
Linux ubuntu 3.2.0-23-generic-pae #36-Ubuntu SMP Tue Apr 10 22:19:09 UTC 2012 i686 i686 i386 GNU/Linux
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x86_64
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| vincent@ubuntu:~$ uname -m
i686
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x86_64
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| vincent@ubuntu:~$ arch
i686
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/bin/cat: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped
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| vincent@ubuntu:~$ file /bin/cat
/bin/cat: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x9e7f078dcc2d3dae02f578a1390debea06a26b74, stripped
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more /proc/cpuinfo
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| vincent@ubuntu:~$ more /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU E5606 @ 2.13GHz
stepping : 2
microcode : 0x10
cpu MHz : 2128.070
cache size : 8192 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss nx rdt
scp constant_tsc up pebs bts xtopology tsc_reliable aperfmperf pni pclmulqdq ssse3 sse4_1 sse4_2 popcnt aes hypervisor arat epb dts
bogomips : 4256.14
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
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/sbin/init: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
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| vincent@ubuntu:~$ file /sbin/init
/sbin/init: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x0ec7a63bbdb983cd488002f4cb87cdc0de5596f8, stripped
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EOF.