方法一：

        file /sbin/init 或 file /bin/ls

        结果如下

[root@localhost ~]# file /sbin/init

/sbin/init: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped

[root@localhost ~]# file /bin/ls

/bin/ls: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped

如果显示为32bit为32位，64bit则为64位。

方法二：

[root@localhost ~]# uname -a

Linux localhost.lw 2.6.32-358.el6.i686 #1 SMP Thu Feb 21 21:50:49 UTC 2013 i686 i686 i386 GNU/Linux

显示x86_64表示为64位，i686则为32位。

方法三：

[root@localhost ~]# getconf LONG_BIT

32

直接看显示结果

查看linux是32位还是64位