如何查询centos查看系统内核版本,系统版本,32位还是64位

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查看centos内核的版本：
# cat /proc/version
Linux version 2.6.32-131.0.15.el6.x86_64 (mockbuild@c6-x8664-build.centos.org) (gcc version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #1 SMP Sat Nov 12 15:11:58 CST 2011
#

# uname -a
Linux localhost.localdomain 2.6.32-131.0.15.el6.x86_64 #1 SMP Sat Nov 12 15:11:58 CST 2011 x86_64 x86_64 x86_64 GNU/Linux

查看linux版本：
# cat /etc/issue
CentOS release 6.1 (Final)
Kernel \r on an \m

# cat /etc/redhat-release
CentOS release 6.1 (Final)
#

查看系统是64位还是32位:
# getconf LONG_BIT
64
# getconf WORD_BIT
32
#

# 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
#