Summary of commands in Linux system to view kernel, CPU, memory, etc.

take a look at the CentOS system information as an example
　　 One: View CPU
less /proc/cpuinfo | grep "model name"
(less can be turned back, Space page, enter the next line; more can not be turned back, Space page, enter the next line)

　　grep "model name" /proc/cpuinfo

Feel the need to look comfortable:grep "model name" /proc/cpuinfo | cut -d: -f2

　　Two: View memory
　　free -m |grep "Mem" | awk ‘{print $2}‘

　　grep MemTotal /proc/meminfo

　　grep MemTotal /proc/meminfo | cut -d: -f2
　　
Three: Check whether the CPU is 32-bit or 64-bit
　　uname -a

　　echo $HOSTTYPE

　　getconf LONG_BIT

　　Four: View the current version of Linux
　　less /etc/system-releaseor cat /etc/redhat-release orcat /etc/issue

　　V: View kernel version
　　uname -rOruname -a

　　VI: View current time
　　date

　　Seven: View hard disks and partitions
　　df -hOrdf -hT

To view partitions:fdisk -l

To view the space occupied by the current directory:du -sh

To view the size of the/etc directory:du /etc -sh

　　Eight: View the installed packages
To view the system installation Fashion package: cat -n /root/install.log orless /root/install.log | wc -l

To view the packages that are now installed: rpm -qa或 rpm -qa | wc -l oryum list installed | wc -l
　　
　　Nine: View the keyboard layout
　　cat /etc/sysconfig/keyboard

　　cat /etc/sysconfig/keyboard | grep KEYTABLE | cut -d= -f2

　　Ten: View selinux status
cat /etc/sysconfig/selinux

　　sestatus

　　sestatus | cut -d: -f2

　　11: View Ip,mac Address
　　ifconfig

　　ifconfig eth0 |grep "inet addr:" |awk ‘{print $2}‘|cut -c 6-

　　ifconfig | grep ‘inet addr:‘| grep -v ‘127.0.0.1‘ | cut -d: -f2 | awk ‘{ print $1}‘

　　cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR

　　cat /etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR | cut -f2 -d=

View Gateway: route -n or netstat -r orip route show

To view DNS: cat /etc/resolv.conf

　　12: View Default language
　　echo $LANG $LANGUAGE

　　cat /etc/sysconfig/i18n

　　13: View your time zone and whether to use UTC time
　　cat /etc/sysconfig/clock

　　14: View Host Name
　　hostnameOrcat /etc/sysconfig/network

Common Query Summary:
1. Kernel version: Uname-r or uname-a
2. Memory capacity: Free-m or grep memtotal/proc/meminfo
3. Operating system version: Cat/etc/issue or Less/etc/system-release or cat/etc/redhat-release
4. View current user name: WhoAmI; View the user's Uid:id or cat/etc/passwd|grep "^root"
5.CPU name and number of cores: Less/proc/cpuinfo | grep "model name"

Summary of commands in Linux system to view kernel, CPU, memory, etc.