Common CentOS commands and common centos commands

Common CentOS commands and common centos commands
System Command yum command

Yum makecache yum generation Cache
Yum list installed mysql * check whether the * package has been installed
Rpm-qa | grep mysql * check whether the mysql * package has been installed
Yum list mysql * check whether there is an installation package
Yum search mysql * search package

Restart

Reboot-h now

Shutdown

Shutdown-h now

-H to avoid MySql corruption

View CPU

More/proc/cpuinfo | grep "model name" # view CPU
Grep "CPU"/proc/cpuinfo # view CPU
Grep "model name"/proc/cpuinfo | cut-f2-d:
Getconf LONG_BIT # Number of CPU digits

CentOS kernel version

Uname-r
Uname-

View Processes

Ps-A: view all processes
Ps-au View Details
Ps f displays the process tree relationship

View port

Lsof-I tcp: 80 view port
Netstat-ntlp: list all ports

View memory

Grep MemTotal/proc/meminfo
Grep MemTotal/proc/meminfo | cut-f2-d:
Free-m | grep "Mem" | awk '{print $2 }'

View System Resources

Vmstat 1-S m

View hard disks and partitions

Df-h
Fdisk-l

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.

Rpm-qa
Rpm-qa | wc-l
Yum list instal
View package installation path

Rpm-ql package name

Firewall

Systemctl start firewalld. service # start firewall
Systemctl stop firewalld. service # stop firewall
Systemctl disable firewalld. service # disable firewall startup

Service iptables status query Firewall status
Service iptables stop
Service iptables start
Service iptables restart
Chkconfig iptables off permanently disabled
Chkconfig iptables on enabled after permanent shutdown

Enable Port

Method 1:
/Sbin/iptables-I INPUT-p tcp-dport 80-j ACCEPT write Modification
/Etc/init. d/iptables save changes
Service iptables restart firewall, modification takes effect

Method 2:
Vi/etc/sysconfig/iptables open the configuration file and add the following statement:
-A input-p tcp-m state-state NEW-m tcp-dport 80-j ACCEPT restart firewall, Modification complete

Close the port

Method 1:
/Sbin/iptables-I INPUT-p tcp-dport 80-j DROP write Modification
/Etc/init. d/iptables save changes
Service iptables restart firewall, modification takes effect
Method 2:
Vi/etc/sysconfig/iptables open the configuration file and add the following statement:
-A input-p tcp-m state-state NEW-m tcp-dport 80-j DROP restart firewall, Modification complete

View port status

/Etc/init. d/iptables status

View Host Name

Hostname
Cat/etc/sysconfig/network

View the file content and display the row number

Cat-n test.txt

Shutdown-r now restart the system to make the settings take effect
Shutdown-h now shutdown
Reboot restart
Power off
Apache

Rpm-qa | grep httpd: Check whether apache is installed in the system.
Start and Stop apache
Service httpd start # start
Service httpd stop # disable
Service httpd restart # restart
/Etc/init. d/httpd restart is also restarted
#/Sbin/chkconfig httpd on [set the startup of the httpd service on the apache server]
#/Sbin/service httpd start [start the httpd service, which has nothing to do with startup]

MySql

Service mysqld start
Service mysqld stop
Mysql-version # view the version

Rpm name command

Rpm-q php # Whether to install PHP
Rpm-q mysql # Whether to install mysql
Rpm-q httpd # Whether to install apache

Whereis mysql # mysql installation location

Set temporary IP settings:

Ifconfig eth0 192.168.1.122

Permanent settings:

Vi/etc/sysconfig/network-scripts/ifcfg-eth0

BOOTPROTO = static
BROADCAST = 192.168.0.255

IPADDR = 12.168.0.33 # If you set the method for obtaining the IP address from the network adapter to static, this field specifies the IP address of the network adapter.
NETMASK = 255.255.255.0 # network mask corresponding to the network adapter
NETWORK = 192.168.0.0 # NETWORK address of the NIC

Vi/etc/sysconfig/network

NETWORKING = yes (indicates whether the system uses the network, which is generally set to yes. If it is set to no, the network cannot be used, and many system service programs cannot be started)
HOSTNAME = centos (set the Host Name of the local machine. The host name set here must correspond to the host name set in/etc/hosts)
GATEWAY = 192.168.0.1 (set the IP address of the GATEWAY connected to the local machine .)

Vi/etc/resolv. conf

Nameserver is the IP address of the DNS server. The first is the first choice, and the second is the backup.

Restart the network:

Service network restart or/etc/init. d/network restart

Zip command

ZIP compression:

Cd/wwwroot
Zip-r wwwroot.zip wwwroot
ZIP:

Cd/home
Unzip wwwroot.zip