怎么查看linux是32位还是64位

[root@DB-Server ~]# getconf LONG_BIT
32

[root@gettestlnx01 ~]# getconf LONG_BIT
64

[root@DB-Server ~]# 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
[root@DB-Server ~]# uname -m
i686

[root@gettestlnx01 ~]# 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
[root@gettestlnx01 ~]# uname -m
x86_64

[root@DB-Server ~]# arch
i686
[root@gettestlnx01 ~]# arch
x86_64

[root@DB-Server ~]# 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
[root@DB-Server ~]#
[root@DB-Server ~]#
[root@DB-Server ~]# 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@gettestlnx01 ~]# 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
[root@gettestlnx01 ~]#
[root@gettestlnx01 ~]#
[root@gettestlnx01 ~]# 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