[root@xuegod41 CA]# yum whatprovides /usr/bin/certtool
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: ftp.cuhk.edu.hk
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
gnutls-utils-2.12.23-21.el6.x86_64 : Command line tools for TLS protocol
Repo : base
Matched from:
Filename : /usr/bin/certtool
gnutls-utils-2.12.23-21.el6.x86_64 : Command line tools for TLS protocol
Repo : installed
Matched from:
Other : Provides-match: /usr/bin/certtool
来源：https://www.cnblogs.com/hailun1987/p/7260456.html