//显示"Print Server"包组信息
[root@localhost ~]# yum groupinfo "Print Server"
Loaded plugins: fastestmirror, security
Setting up Group Process
Loading mirror speeds from cached hostfile
* base: ftp.stu.edu.tw
* extras: mirrors.hustunique.com
* updates: mirrors.hustunique.com
Group: Print Server
Description: Allows the system to act as a print server. //描述
Mandatory Packages: //必须安装的包
cups
printer-filters
Default Packages: //默认安装的包
foomatic-db-ppds
gutenprint
gutenprint-cups
hpijs
paps
# yum clean [ packages | metadata | expire-cache | rpmdb | plugins | all ]
# yum makecache
//清除软件包缓冲
[root@localhost ~]# yum clean packages
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
0 package files removed
//清除软件包元数据缓冲
[root@localhost ~]# yum clean metadata
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
13 metadata files removed
9 sqlite files removed
0 metadata files removed
//清除过期缓冲
[root@localhost ~]# yum clean expire-cache
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
0 metadata files removed
//清除rpmdb数据库
[root@localhost ~]# yum clean rpmdb
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
4 rpmdb files removed
//清除补丁缓冲
[root@localhost ~]# yum clean plugins
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
//清除所有缓冲
[root@localhost ~]# yum clean all
Loaded plugins: fastestmirror, security
Cleaning repos: base extras updates
Cleaning up Everything
//重建缓冲
[root@localhost ~]# yum makecache
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com
base | 3.7 kB 00:00
base/group_gz | 220 kB 00:01
base/filelists_db | 5.9 MB 00:44
base/primary_db | 4.4 MB 00:29
base/other_db | 2.8 MB 00:25
extras | 3.4 kB 00:00
extras/filelists_db | 11 kB 00:00
extras/prestodelta | 907 B 00:00
extras/primary_db | 19 kB 00:00
extras/other_db | 5.8 kB 00:00
updates | 3.4 kB 00:00
updates/filelists_db | 1.5 MB 00:17
updates/prestodelta | 156 kB 00:01
updates/primary_db | 2.1 MB 00:19
updates/other_db | 244 kB 00:01
Metadata Cache Created