Kai Schaetzl wrote:
You are right, there is a difference:
upgrade Is the same as the update command with the --obsoletes flag set. See update for more details.
If the /etc/yum.conf file contains:
obsoletes=1
yum update will be the same as yum upgrade.
The yum.conf file will have this line unless manually removed or you've upgraded from a previous CentOS release that didn't have it. I guess it has to be very old then, the line is present in CentOS 4 and 5...
Mogens