|Linux Standard Base Core Specification, Generic Part|
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Scripts used as part of the package install and uninstall shall only use commands and interfaces that are specified by the LSB. All other commands are not guaranteed to be present, or to behave in expected ways.
Packages shall not use RPM triggers.
Packages shall not depend on the order in which scripts are executed (pre-install, pre-uninstall, etc), when doing an upgrade.