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[v_act]格式：yum [options] [command] [package …]
-y：程序安装前不需要人工确认直接安装
-q：静默安装
[command]
repolist [all|enabled|disabled]：显示仓库列表（默认为enable）；第一次运行是会下载源数据并列出可用仓库列表
list […]：显示所有程序包列表 #指定程序包为查看安装状态
available：显示未安装的程序包
installed：显示已安装的程序包
updates：显示可用的程序更新包
grouplist […]：显示所有程序包组列表
available：显示未安装的程序包组
installed：显示已安装的程序包组
updates：显示可用的程序更新包组
install package1 [package2] […]：安装程序包；可一次安装多程序包；
groupinstall group1 [group2] […]：安装程序包组；可一次安装多程序包组
update [package1] [package2] […]：更新程序包；可一次更新多程序包；
groupupdate group1 [group2] […]：更新程序包组；可一次更新多程序包组；
check-update：检查可更新的程序包
makecache：构建仓库本地缓存
clean all：清理本地所有缓存[/v_act]
[root@localhost ~]# yum repolist
Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Determining fastest mirrors
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
repo id repo name status
!base/7/x86_64 CentOS-7 - Base 9,363
!extras/7/x86_64 CentOS-7 - Extras 381
!updates/7/x86_64 CentOS-7 - Updates 1,881
repolist: 11,625[root@localhost ~]# yum list openssh
Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
Installed Packages
openssh.x86_64 6.6.1p1-22.el7 @anaconda
Available Packages
openssh.x86_64 6.6.1p1-35.el7_3 updates[root@localhost ~]# yum install wget
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: centos.ustc.edu.cn
* updates: centos.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package wget.x86_64 0:1.14-15.el7_4.1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
==================================================================================================================================================
Package Arch Version Repository Size
==================================================================================================================================================
Installing:
wget x86_64 1.14-15.el7_4.1 base 547 k
Transaction Summary
==================================================================================================================================================
Install 1 Package
Total download size: 547 k
Installed size: 2.0 M
Is this ok [y/d/N]: y
Downloading packages:
wget-1.14-15.el7_4.1.x86_64.rpm | 547 kB 00:00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : wget-1.14-15.el7_4.1.x86_64 1/1
Verifying : wget-1.14-15.el7_4.1.x86_64 1/1
Installed:
wget.x86_64 0:1.14-15.el7_4.1
Complete!
