Linux命令 查看Linux版本和是否联网

1.查看Linux内核版本
	1.1 $ cat /proc/version
[heima01@heima01 ~]$ cat /proc/version
Linux version 2.6.32-573.el6.i686 (mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-16) (GCC) ) #1 SMP Thu Jul 23 12:37:35 UTC 2015

[root@frxx ~]# cat /proc/version
Linux version 3.10.0-957.1.3.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Thu Nov 29 14:49:43 UTC 2018

	1.2 $ uname -a
	解释：x86_64表示Linux是64位版本的，i686 i386表示是32位版本的。
[heima01@heima01 ~]$ uname -a
Linux heima01 2.6.32-573.el6.i686 #1 SMP Thu Jul 23 12:37:35 UTC 2015 i686 i686 i386 GNU/Linux

[root@frxx ~]# uname -a
Linux frxx 3.10.0-957.1.3.el7.x86_64 #1 SMP Thu Nov 29 14:49:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

	1.3 $ uname -r
[heima01@heima01 ~]$ uname -r
2.6.32-573.el6.i686

[root@frxx ~]# uname -r
3.10.0-957.1.3.el7.x86_64

2.查看Linux发行版本
	2.1 $ lsb_release -a
[heima01@heima01 ~]$ lsb_release -a
LSB Version:	:base-4.0-ia32:base-4.0-noarch:core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID:	CentOS
Description:	CentOS release 6.7 (Final)
Release:	6.7
Codename:	Final

	2.2 $ cat /etc/issue
[heima01@heima01 ~]$ cat /etc/issue
CentOS release 6.7 (Final)
Kernel \r on an \m

	2.3 $ cat /etc/redhat-release
		$ cat /etc/*release*
[heima01@heima01 ~]$ cat /etc/redhat-release
CentOS release 6.7 (Final)

[heima01@heima01 ~]$ cat /etc/*release*
CentOS release 6.7 (Final)
LSB_VERSION=base-4.0-ia32:base-4.0-noarch:core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
cat: /etc/lsb-release.d: Is a directory
CentOS release 6.7 (Final)
CentOS release 6.7 (Final)
cpe:/o:centos:linux:6:GA
　　　　　2.4 $ rpm -qi centos-release

[root@localhost ~]# rpm -qi centos-release
Name : centos-release
Version : 7
Release : 5.1804.el7.centos
Architecture: x86_64
Install Date: Wed 17 Jul 2019 05:33:06 PM CST
Group : System Environment/Base
Size : 40173
License : GPLv2
Signature : RSA/SHA256, Tue 01 May 2018 12:17:56 AM CST, Key ID 24c6a8a7f4a80eb5
Source RPM : centos-release-7-5.1804.el7.centos.src.rpm
Build Date : Sun 29 Apr 2018 12:35:55 AM CST
Build Host : x86-01.bsys.centos.org
Relocations : (not relocatable)
Packager : CentOS BuildSystem <http://bugs.centos.org>
Vendor : CentOS
Summary : CentOS Linux release file
Description :
CentOS Linux release files

3.查看是否联网
	$ ping www.baidu.com
使用：
	因为使用yum工具安装软件可能需要网络。

	1.没有联网
[heima01@heima01 ~]$ ping www.baidu.com
PING www.a.shifen.com (182.61.200.6) 56(84) bytes of data.
^Z
[2]+  Stopped                 ping www.baidu.com
	2.已经联网
[root@instance-fjii60o3 ~]# ping www.baidu.com
PING www.a.shifen.com (220.181.38.150) 56(84) bytes of data.
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=1 ttl=53 time=3.69 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=2 ttl=53 time=3.50 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=3 ttl=53 time=3.66 ms

4.查看CPU信息
	# cat /proc/cpuinfo

[root@frxx ~]# cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 85
model name	: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
stepping	: 4
microcode	: 0x1
cpu MHz		: 2399.996
cache size	: 28160 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch ibrs ibpb fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f rdseed adx smap clflushopt clwb avx512cd xsaveopt xsavec xgetbv1 arat spec_ctrl
bogomips	: 4799.99
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

[root@heima01 heima01]# cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 158
model name	: Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
stepping	: 9
microcode	: 142
cpu MHz		: 2496.002
cache size	: 6144 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 22
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss nx pdpe1gb rdtscp lm constant_tsc up arch_perfmon xtopology tsc_reliable nonstop_tsc unfair_spinlock pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch arat xsaveopt fsgsbase bmi1 avx2 smep bmi2 invpcid rdseed adx
bogomips	: 4992.00
clflush size	: 64
cache_alignment	: 64
address sizes	: 43 bits physical, 48 bits virtual
power management:

5.查看Linux操作系统位数
	$ getconf LONG_BIT

[heima01@heima01 ~]$ getconf LONG_BIT
32
[root@frxx ~]# getconf LONG_BIT
64