> > >On 10/02/2017 06:24 PM, david wrote: > > 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. > > >There is a java-1.7.0-openjdk-devel or java-1.7.0-openjdk-devel, but no >java-devel True, but then how does "yum install java-devel" know what to install without a package by that name? I thought that the "yum install" command took package (or group) names. And sorry about the error in my rpm command; I meant it without the "yum" in front of it. David