dpkg-trigger --version (return code: 0)
Debian dpkg-trigger package trigger utility version 1.18.4 (amd64). This is free software; see the GNU General Public License version 2 or later for copying conditions. There is NO warranty.
dpkg-trigger --help (return code: 0)
Usage: dpkg-trigger [<options> ...] <trigger-name> dpkg-trigger [<options> ...] <command> Commands: --check-supported Check if the running dpkg supports triggers. -?, --help Show this help message. --version Show the version. Options: --admindir=<directory> Use <directory> instead of /var/lib/dpkg. --by-package=<package> Override trigger awaiter (normally set by dpkg). --await Package needs to await the processing. --no-await No package needs to await the processing. --no-act Just test - don't actually change anything.