Quais são as diferenças técnicas entre “update” e “upgrade” com o yum?

Question

Eu freqüentemente uso o seguinte ao atualizar / atualizar distribuições baseadas em RPM (CentOS, RHEL e Fedora no meu caso):

yum -y update && yum -y upgrade

No entanto, não tenho certeza exatamente de como os dois comandos yum diferem.

Quais são as vantagens de update over upgrade e vice-versa?

    

Answer 1

De acordo com man yum :

update:

If run without any packages, update will update every currently installed package. If one or more packages or package globs are specified, Yum will only update the listed packages. While updating packages, yum will ensure that all dependencies are satisfied. […]

If […] the --obsoletes flag is present yum will include package obsoletes in its calculations - this makes it better for distro-version changes, for example: upgrading from somelinux 8.0 to somelinux 9.

upgrade:

Is the same as the update command with the --obsoletes flag set.