package installation through YUM
 

i hav a cnfusion..... suppose i hav a package in my system locally (copied frm rhel6 dvd to /opt folder ) n i want to install it.....in dis case, is it compulsry to create local file (like local.repo) in /etc/yum.repos.d/ to install it....? ....can not i directly install it using command "yum install /opt/Packages/<package-name>.rpm"....reply plz...

yes, you can do exactly what you suggested. Did you not try it?? Also you can run rom directly.... "rpm -Uvh thatfile.rpm"

Yes, you can. In fact, Redhat recommends to install that way. But what happens when it has dependencies? If you have local repo, then dependencies are taken from that repo, else it is downloaded and installed from 'base' repo.