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according with man yum
update If run
without any packages, update will update every currently installed
package. If one or more packages are specified, Yum will only update
the listed packages.
While
updating packages, yum will ensure that all dependencies are satisfied. If no package matches the given package name(s), they are assumed to be a shell glob and any matches are then installed.
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. See update for more details. --------------------
Itamar Reis Peixoto
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