查看linux系统信息

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1. 查看内核版本命令：

1) [root@q1test01 ~]# cat /proc/version
   Linux version 2.6.9-22.ELsmp (bhcompile@crowe.devel.redhat.com) (gcc version 3.4.4 20050721

3.4.4-2)) #1 SMP Mon Sep 19 18:00:54 EDT 2005

2) [root@q1test01 ~]# uname -a
   Linux q1test01 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:00:54 EDT 2005 x86_64 x86_64 x86_64 GNU/Linux

3) [root@q1test01 ~]# uname -r
   2.6.9-22.ELsmp

2. 查看linux版本：

1) 登录到服务器执行 lsb_release -a ,即可列出所有版本信息,例如:

   [root@3.5.5Biz-46 ~]# [root@q1test01 ~]# lsb_release -a
   LSB Version:    :core-3.0-amd64:core-3.0-ia32:core-3.0-noarch:graphics-3.0-amd64:graphics-3.0-

   ia32:graphics-3.0-noarch
   Distributor ID: RedHatEnterpriseAS
   Description:    Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
   Release:        4
   Codename:       NahantUpdate2
   注:这个命令适用于所有的linux，包括Redhat、SuSE、Debian等发行版。

2) 登录到linux执行cat /etc/issue,例如如下:

   [root@q1test01 ~]# cat /etc/issue
   Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
   Kernel \r on an \m

3) 登录到linux执行cat /etc/redhat-release ,例如如下:

   [root@q1test01 ~]# cat /etc/redhat-release
   Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
   注:这种方式下可以直接看到具体的版本号，比如 AS4 Update 1

4) 登录到linux执行rpm -q redhat-release ,例如如下:

   [root@q1test01 ~]# rpm -q redhat-release
   redhat-release-4AS-3
   注:这种方式下可看到一个所谓的release号，比如上边的例子是3
   这个release号和实际的版本之间存在一定的对应关系，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
   另:第3)、4)两种方法只对Redhat Linux有效.

查看系统是64位还是32位:

1、getconf LONG_BIT or getconf WORD_BIT

2、file /bin/ls

3、lsb_release -a

查看CPU核数

[root@localhost ~]# cat /proc/cpuinfo

processor : 0

vendor_id : GenuineIntel

cpu family : 6

model : 37

model name : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

stepping : 5

cpu MHz : 3079.251

cache size : 6144 KB

physical id : 0

siblings : 4

core id : 0

cpu cores : 4

apicid : 0

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bugontab.XX: noRdsB" 2L, 140C

fpu : yes

fpu_exception : yes

cpuid level : 5

wp : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht constant_tsc pni ssse3

bogomips : 6158.50

processor : 1

vendor_id : GenuineIntel

cpu family : 6

model : 37

model name : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

stepping : 5

cpu MHz : 3079.251

cache size : 6144 KB

physical id : 0

siblings : 4

core id : 1

cpu cores : 4

apicid : 1

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 5

wp : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht constant_tsc pni ssse3

bogomips : 7141.77

processor : 2

vendor_id : GenuineIntel

cpu family : 6

model : 37

model name : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

stepping : 5

cpu MHz : 3079.251

cache size : 6144 KB

physical id : 0

siblings : 4

core id : 2

cpu cores : 4

apicid : 2

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 5

wp : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht constant_tsc pni ssse3

bogomips : 7896.05

processor : 3

vendor_id : GenuineIntel

cpu family : 6

model : 37

model name : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

stepping : 5

cpu MHz : 3079.251

cache size : 6144 KB

physical id : 0

siblings : 4

core id : 3

cpu cores : 4

apicid : 3

fdiv_bug : no

hlt_bug : no

f00f_bug : no

coma_bug : no

fpu : yes

fpu_exception : yes

cpuid level : 5

wp : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht constant_tsc pni ssse3

bogomips : 6227.18

[root@localhost ~]# top

注：输入Top后按回车然后按1出现如下所示

top - 08:12:30 up 6 min, 1 user, load average: 0.41, 0.23, 0.10

Tasks: 247 total, 2 running, 245 sleeping, 0 stopped, 0 zombie

Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 96.7%id, 0.0%wa, 0.0%hi, 3.3%si, 0.0%st

Cpu1 : 0.3%us, 0.3%sy, 0.0%ni, 97.1%id, 0.0%wa, 0.0%hi, 2.3%si, 0.0%st

Cpu2 : 0.0%us, 0.0%sy, 0.0%ni, 98.0%id, 0.0%wa, 0.0%hi, 2.0%si, 0.0%st

Cpu3 : 0.3%us, 1.0%sy, 0.0%ni, 93.8%id, 0.0%wa, 0.7%hi, 4.3%si, 0.0%st

Mem: 2074964k total, 592648k used, 1482316k free, 31972k buffers

Swap: 2097144k total, 0k used, 2097144k free, 160108k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME COMMAND

2502 www 15 0 92208 6628 4196 S 0.6 0.3 0:00.20 php-cgi

422 root 10 -5 0 0 0 S 0.3 0.0 0:00.23 kjournald

2398 root 15 0 10064 2940 2372 R 0.3 0.1 0:00.19 sshd

2480 www 15 0 92464 7400 4948 S 0.3 0.4 0:01.70 php-cgi

2492 www 16 0 92208 6752 4312 S 0.3 0.3 0:00.16 php-cgi

2501 www 15 0 92464 6500 4072 S 0.3 0.3 0:00.24 php-cgi

2533 www 15 0 21096 15m 772 S 0.3 0.8 0:01.48 nginx

3513 root 15 0 2428 1104 788 R 0.3 0.1 0:00.54 top

1 root 15 0 2160 644 556 S 0.0 0.0 0:01.19 init

2 root RT -5 0 0 0 S 0.0 0.0 0:00.01 migration/0

3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0

4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0

5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/1

6 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1

7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1

8 root RT -5 0 0 0 S 0.0 0.0 0:00.01 migration/2