[CentOS] installonlypkgs vs. exclude in yum.conf

HI,

with "exclude" in yum.conf I can exclude kernel-updates via:
exclude=kernel*

If I use installonlypkgs, what happend exactly?

Like:
installonlypkgs=kernel kernel-smp kernel-devel kernel-smp-devel  
kernel-largesmp kernel-largesmp-devel kernel-hugemem  
kernel-hugemem-devel

What's the difference betwenn update and installonly?

Thanx!


ttyl,
      Django
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