NAME

       dpkg-trigger - a package trigger utility

SYNOPSIS

       dpkg-trigger [option...] trigger-name
       dpkg-trigger [option...] command

DESCRIPTION

       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 situations 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.

COMMANDS

       --check-supported
              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-trigger.

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

       --version
              Show the version and exit.

OPTIONS

       --admindir=dir
              Change the location of the dpkg database. The default location is /var/lib/dpkg.

       --by-package=package
              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).

       --no-await
              This option arranges that the calling package T (if any) need not await  the  processing  of  this
              trigger; the interested package(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.

       --await
              This  option  does  the inverse of --no-await (since dpkg 1.17.21).  If the interested package has
              declared a “noawait” directive, then this option will not  be  effective.   It  is  currently  the
              default behavior.

       --no-act
              Just test, do not actually change anything.

EXIT STATUS

       0      The requested action was successfully performed.  Or a check or assertion command returned true.

       1      A check or assertion command returned false.

       2      Fatal  or  unrecoverable error due to invalid command-line usage, or interactions with the system,
              such as accesses to the database, memory allocations, etc.

ENVIRONMENT

       DPKG_ADMINDIR
              If set and the --admindir option has not been  specified,  it  will  be  used  as  the  dpkg  data
              directory.

       DPKG_COLORS
              Sets  the  color  mode  (since  dpkg  1.18.5).  The currently accepted values are: auto (default),
              always and never.

SEE ALSO

       dpkg(1), deb-triggers(5), /usr/share/doc/dpkg-dev/triggers.txt.gz.