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+# dpkg manual page - deb-triggers(5)
+#
+# Copyright © 2008, 2013-2015 Guillem Jover <guillem@debian.org>
+# Copyright © 2011, 2014 Raphaël Hertzog <hertzog@debian.org>
+#
+# This is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+=encoding utf8
+
+=head1 NAME
+
+deb-triggers - package triggers
+
+=head1 SYNOPSIS
+
+B<debian/triggers>, B<debian/>I<binary-package>B<.triggers>, 
+B<DEBIAN/triggers>
+
+=head1 DESCRIPTION
+
+A package declares its relationship to some trigger(s) by including
+a I<triggers> file in its control archive (i.e. I<DEBIAN/triggers>
+during package creation).
+
+This file contains directives, one per line. Leading and trailing whitespace
+and everything after the first B<#> on any line will be trimmed, and
+empty lines will be ignored.
+
+The trigger control directives currently supported are:
+
+=over
+
+=item B<interest> I<trigger-name>
+
+=item B<interest-await> I<trigger-name>
+
+=item B<interest-noawait> I<trigger-name>
+
+Specifies that the package is interested in the named trigger. All
+triggers in which a package is interested must be listed using this
+directive in the triggers control file.
+
+The “await” variants put the triggering package in triggers-awaited
+state depending on how the trigger was activated.
+The “noawait” variant does not put the triggering packages in
+triggers-awaited state, even if the triggering package declared an
+“await” activation (either with an B<activate-await> or B<activate>
+directive, or by using the B<dpkg-trigger> B<--no-await>
+command-line option).
+The “noawait” variant should be used when the functionality provided
+by the trigger is not crucial.
+
+=item B<activate> I<trigger-name>
+
+=item B<activate-await> I<trigger-name>
+
+=item B<activate-noawait> I<trigger-name>
+
+Arranges that changes to this package's state will activate the
+specified trigger. The trigger will be activated at the start of
+the following operations: unpack, configure, remove (including for
+the benefit of a conflicting package), purge and deconfigure.
+
+The “await” variants only put the triggering package in triggers-awaited
+state if the interest directive is also “await”.
+The “noawait” variant never puts the triggering packages in
+triggers-awaited state.
+The “noawait” variant should be used when the functionality provided
+by the trigger is not crucial.
+
+If this package disappears during the unpacking of another package
+the trigger will be activated when the disappearance is noted
+towards the end of the unpack. Trigger processing, and transition
+from triggers-awaited to installed, does not cause activations.
+In the case of unpack, triggers mentioned in both the old and new
+versions of the package will be activated.
+
+=back
+
+Unknown directives are an error which will prevent installation of the
+package.
+
+The “-noawait” variants should always be favored when possible since
+triggering packages are not put in triggers-awaited state and can thus
+be immediately configured without requiring the processing of the trigger.
+If the triggering packages are dependencies of other upgraded packages,
+it will avoid an early trigger processing run and make it possible
+to run the trigger only once as one of the last steps of the upgrade.
+
+The “-noawait” variants are supported since dpkg 1.16.1, and
+will lead to errors if used with an older dpkg.
+
+The “-await” alias variants are supported since dpkg 1.17.21, and
+will lead to errors if used with an older dpkg.
+
+When a package provides an B<interest-noawait> directive, any activation
+will set the triggering package into “noawait” mode, regardless of the
+awaiting mode requested by the activation (either “await” or “noawait”).
+When a package provides an B<interest> or B<interest-await> directive,
+any activation will set the triggering package into “await” or “noawait“
+depending on how it was activated.
+
+=head1 SEE ALSO
+
+B<dpkg-trigger>(1),
+B<dpkg>(1),
+B<%PKGDOCDIR%/triggers.txt.gz>.