On 10/02/2017 07:07 PM, david wrote: > >> >> >> 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 Packages have 'names' and they also have 'Provides'. To see the things that java-1.7.0-openjdk-devel provides, you can use this command: rpm -qp --provides java-1.7.0-openjdk-devel-1.7.0.151-2.6.11.1.el7_4.x86_64.rpm This is the output: application() application(java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64-jconsole.desktop) application(java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64-policytool.desktop) java-1.7.0-devel = 1:1.7.0.151 java-1.7.0-openjdk-devel = 1:1.7.0.151-2.6.11.1.el7_4 java-1.7.0-openjdk-devel(x86-64) = 1:1.7.0.151-2.6.11.1.el7_4 java-devel = 1:1.7.0 java-devel-openjdk = 1:1.7.0.151 java-sdk = 1:1.7.0 java-sdk-1.7.0 = 1:1.7.0.151 java-sdk-1.7.0-openjdk = 1:1.7.0.151 java-sdk-openjdk = 1:1.7.0.151 lib.so(SUNWprivate_1.1)(64bit) libjli.so()(64bit) libjli.so(SUNWprivate_1.1)(64bit) ====== yum install or yum update can be used with either a provide or a name .. list only works with names. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20171003/f34afa7f/attachment-0004.sig>