Package triggers under Debian Linux
dpkg-trigger command is a software package trigger under Debian Linux.
dpkg-trigger(options)(parameters)
--check-supported: Check whether the running dpkg supports triggers. If the return value is 0, it means triggers are supported.
--help: display help information;
--admindir=<directory>: Set the directory where the dpkg database is located;
--no-act: only for testing, do not perform any operation;
--by-package=<package>: Override trigger waiters.
Trigger name: Specify the trigger name.