> Date: Monday, October 02, 2017 16:24:20 -0700 > From: david <david at 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.