yum list-security

when i tried to run a command as my friend did : yum list-security, it seems not such command options.

so confused, but after i checked with my old friend: google, i got the answer from a corner.

here is the solution.

   we need to edit the /etc/yum.conf, and set the plubings=1 as bellow:

      ***********************

 cat /etc/yum.conf
[main]
cachedir=/var/cache/yum
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
distroverpkg=redhat-release
tolerant=1
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1

原文：http://dogrider.blog.51cto.com/771879/1719216