Linux下查看系统位数（32/64位）

1. 从系统查看

1.1 uname -a 命令

[root@qs-dmm-rh2 ~]# uname -a

Linux qs-dmm-rh2 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:43 EDT 2010 i686 i686 i386 GNU/Linux

 

[root@qs-xezf-db2 ~]# uname -a

Linux qs-xezf-db2 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

1.2 file /bin/ls 命令

[root@qs-dmm-rh2 ~]# 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

 

[root@qs-xezf-db2 ~]# file /bin/ls

/bin/ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped

1.3 getconf LONG_BIT 命令

[root@qs-dmm-rh2 ~]# getconf LONG_BIT

32

 

[root@qs-xezf-db2 ~]# getconf LONG_BIT

64

 

1.4 arch命令

[root@qs-dmm-rh2 ~]# arch

i686

 

[root@qs-xezf-db2 ~]# arch

x86_64

2. 从CPU查看

[root@qs-dmm-rh2 ~]# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l

0

 

[root@qs-xezf-db2 ~]# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l

8

 

结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit。