View System Information in CentOS-CentOS command

View System Information in CentOS-CentOS command

I. View cpu

 
 

  
  
more /proc/cpuinfo | grep "model name"  
  
  
grep "model name" /proc/cpuinfo 
 
 

If you feel more comfortable to watch

 
 

  
  
grep "model name" /proc/cpuinfo | cut -f2 -d: 
 
 

How about linux commands.

Ii. Check in

 
 

  
  
[root@CentOS ~]# grep MemTotal /proc/meminfo  
  
  
[root@CentOS ~]# grep MemTotal /proc/meminfo | cut -f2 -d:  
  
  
[root@CentOS ~]# free -m |grep "Mem" | awk '{print $2}'  
  
  
[root@CentOS ~]# free -m 
 
 

Iii. Check whether the cpu is 32-bit or 64-bit

View CPU bits (32 or 64)

 
 

  
  
[root@CentOS ~]# getconf LONG_BIT  
  
  
[root@CentOS ~]# echo $HOSTTYPE  
  
  
[root@CentOS ~]# uname -a 
 
 

Iv. view the current linux version

 
 

  
  
[root@CentOS ~]# more /etc/redhat-release  
  
  
[root@CentOS ~]# cat /etc/redhat-release 
 
 

V. view the kernel version

 
 

  
  
[root@CentOS ~]# uname -r  
  
  
[root@CentOS ~]# uname -a 
 
 

6. view the current time

 
 

  
  
[root@CentOS ~]# date 
 
 

7. View hard disks and partitions

 
 

  
  
[root@CentOS ~]# df -h  
  
  
[root@CentOS ~]# fdisk -l 
 
 

You can also view partitions.

 
 

  
  
[root@CentOS home]# du -sh 
 
 

The occupied space is displayed.

 
 

  
  
[root@CentOS home]# du /var/www -sh 
 
 

The directory size is displayed.

8. View installed software packages

View the software packages installed during system installation

 
 

  
  
cat -n /root/install.log  
  
  
more /root/install.log | wc -l 
 
 

Check the software packages that have been installed.

 
 

  
  
[root@CentOS home]# rpm -qa  
  
  
.......................  
  
  
.......................  
  
  
.......................  
  
  
.......................  
  
  
.......................  
  
  
[root@CentOS home]# rpm -qa | wc -l  
  
  
[root@CentOS home]# yum list installed | wc -l 
 
 

But it is strange that the number of installation packages I query through rpm and yum is not the same. No reason is found.

9. view the keyboard layout

 
 

  
  
[root@CentOS home]# cat /etc/sysconfig/keyboard  
  
  
[root@CentOS home]# cat /etc/sysconfig/keyboard | grep KEYTABLE | cut -f2 -d= 
 
 

10. View selinux Information

 
 

  
  
[root@CentOS home]# sestatus  
  
  
[root@CentOS home]# sestatus | cut -f2 -d:  
  
  
[root@CentOS home]# cat /etc/sysconfig/selinux 
 
 

11. View ip address and mac address

In the ifcfg-eth0 file you can see mac, Gateway and other information.

 
 

  
  
[root@CentOS home]# ifconfig  
  
  
[root@CentOS home]# cat /etc/sysconfig/network-scripts/ifcfg-Auto_eth0  
  
  
[root@CentOS home]# cat /etc/sysconfig/network-scripts/ifcfg-Auto_eth0 | grep IPADDR | cut -f2 -d=  
  
  
[root@CentOS home]# ifconfig eth0 |grep "inet addr:" |awk '{print $2}'|cut -c 6-  
  
  
[root@CentOS home]# ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}' 
 
 

View Gateway

 
 

  
  
[root@CentOS home]# cat /etc/sysconfig/network 
 
 

View dns

 
 

  
  
[root@CentOS home]# cat /etc/resolv.conf 
 
 

12: view the default language

 
 

  
  
[root@CentOS home]# echo $LANG $LANGUAGE  
  
  
[root@CentOS home]# cat /etc/sysconfig/i18n 
 
 

Thirteen: Check the time zone and whether the UTC time is used.

 
 

  
  
[root@CentOS /]# cat /etc/sysconfig/clock 
 
 

14. view the Host Name

 
 

  
  
[root@CentOS /]# hostname  
  
  
[root@CentOS /]# cat /etc/sysconfig/network 
 
 

Modifying the host name is to modify this file, and it is best to modify the host file as well.