用命令查詢系統是32位還是64位
getconf LONG_BIT or getconf WORD_BIT
例如：
[root@sy02 /]# getconf LONG_BIT
64
2.file command
例如：
[root@sy02 /]# file /bin/ls
/bin/ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped
查看linux的版本主要有三種方法：
1)uname -a
2)cat /proc/version
3)cat /etc/issue
4) ls /boot
5) lsb_release -a
1) 登錄到服務器執行 lsb_release -a ，即可列出所有版本信息，例如：
[[email protected] ~]# lsb_release -a
LSB Version: 1.3
Distributor ID: RedHatEnterpriseAS
Description: Red Hat Enterprise Linux AS release 4 (Nahant Update 1)
Release: 4
Codename: NahantUpdate1
[[email protected] ~]#
這個命令適用於所有的linux，包括Redhat、SuSE、Debian等發行版。
2) 登錄到linux執行cat /etc/redhat-release ，例如如下：
[[email protected] ~]# cat /etc/redhat-release
Red Hat Enterprise Linux AS release 4 (Nahant Update 1)
[[email protected] ~]#
這種方式下可以直接看到具體的版本號，比如 AS4 Update 1
3）登錄到linux執行rpm -q redhat-release ，例如如下
[[email protected] ~]# rpm -q redhat-release
redhat-release-4AS-2.4
[[email protected] ~]#
這種方式下可看到一個所謂的release號，比如上邊的例子是2.4
這個release號和實際的版本之間存在一定的對應關係，如下：
redhat-release-3AS-1 -> Redhat Enterprise Linux AS 3
redhat-release-3AS-7.4 -> Redhat Enterprise Linux AS 3 Update 4
redhat-release-4AS-2 -> Redhat Enterprise Linux AS 4
redhat-release-4AS-2.4 -> Redhat Enterprise Linux AS 4 Update 1
redhat-release-4AS-3 -> Redhat Enterprise Linux AS 4 Update 2
redhat-release-4AS-4.1 -> Redhat Enterprise Linux AS 4 Update 3
redhat-release-4AS-5.5 -> Redhat Enterprise Linux AS 4 Update 4
注意：第（2）（3）兩種方法只對Redhat Linux有效
