Date: Monday, October 02, 2017 16:24:20 -0700 From: david david@daku.org

Folks

I performed an install of "java-devel". Several packages got installed. So far so good.

Yet, when I performed yum list installed | grep java-devel and also yum rpm -qa | grep java-devel

it did not show up as already installed.

This behavior appears both on Centos7 and Centos6. This bothers me because as a time-saving effort, I maintain the last output of "yum list installed" and quickly determine whether it's worth running yum. True, yum would "do nothing", but that takes several seconds.

Is there some simple explanation? It works for all the other packages I've installed.

David

What gets installed with a "yum install java-devel" command is:

java-1.8.0-openjdk-devel.x86_64

which is why your "yum list installed | grep java-devel" doesn't find it. If you did, instead, "yum list installed | grep java | grep devel" it would work.

Your "yum rpm -qa | grep java-devel" isn't a valid yum option. The correct command:

rpm -qa | grep java-devel

would fail to find it for the same reason your "yum list" command did.

Try instead:

rpm -qa java* | grep devel

that should turn it up:

java-1.8.0-openjdk-devel.x86_64 1:1.8.0.144-0.b01.el7_4 @updates

Your /var/log/yum.log shows the names of the packages installed, which can help if there is confusion.