-Upgrading RPMs

[puneet puri <puneet8033 yahoo com>]

a) Can the -U option be used to upgrade a installed
package when dependencies( pre-requisite ) exist on it
?

b) Does the Upgrade of an RPM remove the already
existing files if they are not a part of the new RPM ?
( or its has to be handled manually using the
preinstall section of the spec file)

-Thanks
Puneet

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