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dpkg-trigger [option...] trigger-name
dpkg-trigger [option...] command
dpkg-trigger is a tool to explicitly activate triggers and check for
its support on the running dpkg.
This can be used by maintainer scripts in complex and conditional situ-
ations where the file triggers, or the declarative activate triggers
control file directive, are insufficiently rich. It can also be used
for testing and by system administrators (but note that the triggers
won't actually be run by dpkg-trigger).
Unrecognised trigger name syntaxes are an error for dpkg-trigger.
Check if the running dpkg supports triggers (usually called from
a postinst). Will exit 0 if a triggers-capable dpkg has run, or
1 with an error message to stderr if not. Normally, however, it
is better just to activate the desired trigger with dpkg-trig-
Show the usage message and exit.
Show the version and exit.
Change the location of the dpkg database. The default location
Override trigger awaiter (normally set by dpkg through the
DPKG_MAINTSCRIPT_PACKAGE environment variable of the maintainer
scripts, naming the package to which the script belongs, and
this will be used by default).
This option arranges that the calling package T (if any) need
not await the processing of this trigger; the interested pack-
age(s) I, will not be added to T's trigger processing awaited
list and T's status is unchanged. T may be considered installed
even though I may not yet have processed the trigger.
Just test, do not actually change anything.