1.描述

 [root@oomcserver ~]# yum search ytalk
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Warning: No matches found for: ytalk
No matches found

yum仓库里没有这个包，怎么下载这个命令使用呢？ 

2.下载对应的rpm包

在rpmfind网站搜索 ytalk，找到对应的包，rpm安装即可使用该命令