方法1：getconf LONG_BIT 查看
如下例子所示： 32位Linux系统显示32， 64位Linux系统显示64。最简单、快捷的方法。
[[email protected] ~]# getconf LONG_BIT
32
[[email protected] ~]# getconf LONG_BIT
64
方法2：uname命令查看
如下例子所示，x86_64表示64位系统， i686 i386表示32位系统。i686 只是i386的一个子集,支持的cpu从Pentium 2 (686)开始,之前的型号不支持.
[[email protected] ~]# uname -a
Linux DB-Server 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:43 EDT 2010 i686 i686 i386 GNU/Linux
[[email protected] ~]# uname -m
i686
[[email protected] ~]# uname -a
Linux gettestlnx01 3.8.13-16.2.1.el6uek.x86_64 #1 SMP Thu Nov 7 17:01:44 PST 2013 x86_64 x86_64 x86_64 GNU/Linux
[[email protected] ~]# uname -m
x86_64
方法3: arch命令查看
[[email protected] ~]# arch
i686
[[email protected] ~]# arch
x86_64
方法4: file命令查看
[[email protected] ~]# file /sbin/init
/sbin/init: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
[[email protected] ~]#
[[email protected] ~]#
[[email protected] ~]# file /bin/ls
/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
[[email protected] ~]# file /sbin/init
/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped
[[email protected] ~]#
[[email protected] ~]#
[[email protected] ~]# file /bin/ls
/bin/ls: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped
方法5: 此方法来自于David的博客，通过查看CPU的信息来判定Linux系统是否是64位操作系统。如果结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit。
[[email protected] ~]# cat /proc/cpuinfo | grep flags | grep ‘ lm ‘ | wc -l
0
[[email protected] ~]# cat /proc/cpuinfo | grep flags | grep ‘ lm ‘ | wc -l
6
