Basic usage and examples of yum (recommended)

# Common command install: install rpm software package;
update: update the rpm package;
check-update: Checks whether there is an updated rpm package available;
remove: delete the specified rpm package;
list: Displays information about software packages;
search: check the information of the software package;
info: Displays the description and summary information of the specified rpm software package;
clean: cleans up the expired yum cache;
shell: Enter the yum shell prompt;
resolvedep: Displays the dependencies of the rpm software package;
localinstall: install the local rpm package;
localupdate: Displays the local rpm package for update;
deplist: Displays all dependencies of the rpm package.

alias List or create command aliases autoremove Remove all unnecessary packages that were originally installed due to dependencies check Find problems in the package database check-update Check if there are any package upgrades clean Delete cached data deplist List the dependencies of packages and the sources that provide these packages distro-sync Synchronize installed packages to the latest available versions downgrade Downgrade packages group Display or use group information help Display a helpful usage message history Display or use transaction history info Display detailed information about a package or package group install Install one or more packages to the system list List one or a group of packages makecache Create a metadata cache mark Mark or unmark packages installed by the user in the installed packages.
module interacts with modules.
provides Finds packages that provide the specified content reinstall Reinstall a package remove Remove one or more packages from the system repolist Displays configured repositories repoquery Searches for packages matching a keyword repository-packages Runs a command for all packages in the specified repository search Searches for a specified string in the package details shell Runs an interactive DNF terminal swap Runs an interactive DNF terminal to remove or install a spec description file updateinfo Displays reference suggestions for a package upgrade Upgrades one or more packages in the system upgrade-minimal Upgrades, but only the "latest" packages have fixed problems that may affect your system

builddep Install build dependencies for package or spec file
changelog View the change log data of the package config-manager Manage dnf configuration options and software repositories copr Interact with the Copr repository debug-dump Dump the installed RPM package information to a file debug-restore Restore the package records in the debug dump file debuginfo-install Install the debugging information package download Download the package to the current directory needs-restarting Determine whether the upgraded binary file needs to be restarted playground Interact with the Playground repository.
repoclosure displays a list of unresolved dependencies in the repository repodiff lists the differences between two sets of repositories repograph outputs a complete package dependency graph in a dot-line graph format repomanage manages RPM package directories reposync downloads all packages from a remote repository

yum install #install all yum install package1 #install the specified installation package package1
yum groupinsall group1 #installation program group group1

yum update #Update all yum update package1 #Update the specified package package1
yum check-update #Check for updatable programs yum upgrade package1 #Upgrade the specified package package1
yum groupupdate group1 #Upgrade program group group1

yum info package1 #Display installation package information package1
yum list #Shows all installed and installable packages yum list package1 #Shows the installation status of the specified package package1
yum groupinfo group1 #Display information of program group group1 yum search string Search for installation packages based on keyword string

yum remove | erase package1 #Delete package1
yum groupremove group1 #Delete program group group1
yum deplist package1 #View the dependencies of package1

yum clean packages #Clear the packages in the cache directory yum clean headers #Clear the headers in the cache directory
yum clean oldheaders #Clear old headers in the cache directory
yum clean all #Clear all cache directories

[root@alliancehacker ~]# mkdir -p /root/back
[root@alliancehacker ~]# mv /etc/yum.repos.d/CentOS-Base.repo /root/back/CentOS-Base.repo.back

// Because I am using centos8, I chose Centos-8.repo as the source
[root@alliancehacker ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

#There are several folders in /etc/yum.repo.d, each folder is a source configuration file. #For example:
#(1) local.repo (local source, name optional)
[local]
name=local
baseurl=file:///mnt/cdrom
gpgcheck=0
enabled=1
#(II) 163.repo (source of 163)
[163]
name=163
baseurl=http://mirrors.163.com/centos/7.5.1804/os/x86_64/
gpgcheck=0
enabled=1
#Please note that for the baseurl item, you need to go to http://mirrors.163.com/centos, find the directory of your corresponding redhat version, then click os, then x86_64 (usually both are there), and then replace the baseurl above with the URL displayed in your address bar, save and exit.

mount -o loop -t iso9660 /opt/tools/CentOS-7-x86_64-bin-DVD1.iso /mnt/vcdrom

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.back

[root@localhost ~]# cat /etc/yum.repos.d/CentOS-Media.repo 
[c7-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt/vcdrom/ #Change baseurl to the mount directory of the DVD gpgcheck=0 #Turn off key detection enabled=1 #Enable the repository #gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[root@localhost ~]#vim /opt/shell/mymount.sh
#!/bin/bash
#
mount -o loop -t iso9660 /opt/tools/CentOS-6.7-x86_64-bin-DVD1.iso /mnt/vcdrom

[root@localhost ~]#vim /etc/rc.local
/opt/shell/mymount.sh

#Add a few sources, otherwise an error will be reported #The yum source address of the higher version of php has two parts, one of which is epel-release and the other is from webtatic. If you skip epel-release, install webtatic with rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
rpm -Uvh http://rpms.remirepo.net/enterprise/remi-release-8.rpm

yum --enablerepo=remi install php73-php php73-php-pear php73-php-bcmath php73-php-pecl-jsond-devel php73-php-mysqlnd php73-php-gd php73-php-common php73-php-fpm php73-php-intl php73-php-cli php73-php php73-php-xml php73-php-opcache php73-php-pecl-apcu php73-php-pdo php73-php-gmp php73-php-process php73-php-pecl-imagick php73-php-devel php73-php-mbstring php73-php-zip php73-php-ldap php73-php-imap php73-php-pecl-mcrypt

# The current PHP memory limit is below the recommended value of 512MB.
vi /etc/opt/remi/php73/php.ini
memory_limit = 512M

#If you are running nginx instead of apache, modify vi /etc/opt/remi/php73/php-fpm.d/www.conf
user = apache
group = apache
# Replace the values ​​with
user = nginx
group = nginx