Centos commands: Yum Upgrade versus Yum update


 
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# 1  
Old 01-28-2010
Centos commands: Yum Upgrade versus Yum update

Hi,

I would like to know the difference between YUM UPDATE and YUM UPGRADE. The man pages say upgrade is same as update with the obsolete option. And by default it says the obsolete option is turned on, which would make them equivalent. Does not say what obsolete does.

Can someone please clarify?
# 2  
Old 01-28-2010
Upgarde will delete obsolete packages, while update will preserve them.
# 3  
Old 01-28-2010
I still do not really understand the difference.

Could you illustrate with an example please?
# 4  
Old 01-28-2010
I may be wrong, but... . When the distribution developers decide that some package should not be used and will want to get rid of it from the whole package pool they will mark it obsolete. They may provide some replacement. "Update" will leave the packet as it was on your system. Upgrade will delete such packages and possibly install replacements.
 
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