View CPU information:
More/proc/cpuinfo | grep "model name"
Generally, it is a Xeon system.
View memory information:
Grep memtotal/proc/meminfo
Free-m
View the number of digits of the system:
Getconf long_bit
View the system version:
CAT/etc/RedHat-release
View the system kernel version:
Uname-R
Uname-
Use common commands to view the current time
Date
Use commands to view hard disks and partitions
DF-H
Fdisk-l
You can also view partitions.
Du-SH
DU/home-SH
View the directory size:
View installed software packages
CAT/root/install. Log
View normal system logs
Normal rpm Installation
Check the software packages installed:
Rpm-Qa
Rpm-Qa | WC-l
Yum List Installed | well
View the keyboard layout using common centos commands
CAT/etc/sysconfig/keyboard
View the IP address and MAC address:
Ifconfig
View the default system language:
Echo $ Lang $ Language
CAT/etc/sysconfig/i18n
Check whether the system uses UTC time
CAT/etc/sysconfig/clock
View Host Name
Hostname
CAT/etc/sysconfig/Network
View the system load:
Uptime
Vmstat 1-S M
Practical commands:
Download resources from wget URL
Decompress the tar zxvf compressed package name
Kill the process of an application
Find/-type F-size + 100000 K-ls
Search for files larger than 100000
Create a file system type
Umount/dev/sdb1
Mkfs-T ext2/dev/sdb1
Mount/dev/sdb1/practice
CAT/etc/rc. d/rc. Local
Du-SH
Uptime
CAT/proc/loadavg
22: Automatic startup settings
Vim/etc/rc. d/rc. Local
Du-SH: view the size of the specified directory
Uptime: view system running time, number of users, and load
CAT/proc/loadavg view system load
Edit the RC. Local file
# Vim/etc/rc. d/rc. Local
# Du-SH # view the size of a specified directory
# Uptime # view system running time, number of users, and load
# Cat/proc/loadavg # view system load
# Iptables-L # view firewall settings
# Route-N # view the route table
# Netstat-lntp # view all listening ports
# Netstat-antp # view all established connections
# Netstat-s # view network statistics
# W # view active users
# ID # view specified user information
# Last # view User Logon logs
# Cut-D:-F1/etc/passwd # view all users in the system
# Cut-D:-F1/etc/group # view all groups in the system
# Crontab-L # view the scheduled tasks of the current user
# Chkconfig-list # list all system services
# Chkconfig-list | grep on # list all started system services
Common commands for Redhat and centos
