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).

       Unrecognized 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-

       -?, --help
              Show the usage message and exit.

              Show the version and exit.

              Change the location of the dpkg database. The  default  location
              is /var/lib/dpkg.

              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.

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