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+# dpkg manual page - dpkg-trigger(1)
+#
+# Copyright © 2008-2015 Guillem Jover <guillem@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
+
+dpkg-trigger - a package trigger utility
+
+=head1 SYNOPSIS
+
+B<dpkg-trigger>
+[I<option>...] I<trigger-name>
+
+B<dpkg-trigger>
+[I<option>...] I<command>
+
+=head1 DESCRIPTION
+
+B<dpkg-trigger> is a tool to explicitly activate triggers and check
+for its support on the running B<dpkg>.
+
+This can be used by maintainer scripts in complex and conditional
+situations where the file triggers, or the declarative B<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 B<dpkg-trigger>).
+
+Unrecognized trigger name syntaxes are an error for B<dpkg-trigger>.
+
+This program was introduced in dpkg 1.14.17.
+
+=head1 COMMANDS
+
+=over
+
+=item B<--check-supported>
+
+Check if the running B<dpkg> supports triggers (usually called from a
+postinst).
+Will exit B<0> if a triggers-capable B<dpkg> has run,
+or B<1> with an error message to stderr if not.
+Normally, however,
+it is better just to activate the desired trigger with B<dpkg-trigger>.
+
+=item B<-?>, B<--help>
+
+Show the usage message and exit.
+
+=item B<--version>
+
+Show the version and exit.
+
+=back
+
+=head1 OPTIONS
+
+=over
+
+=item B<--admindir=>I<dir>
+
+Change the location of the B<dpkg> database.
+Defaults to I<%ADMINDIR%> if B<DPKG_ADMINDIR> has not been set.
+
+=item B<--root=>I<directory>
+
+Set the root directory to I<directory>, which sets the administrative
+directory to «I<directory>%ADMINDIR%» (since dpkg 1.21.0).
+
+=item B<--by-package=>I<package>
+
+Override trigger awaiter (normally set by B<dpkg> through the
+B<DPKG_MAINTSCRIPT_PACKAGE> environment variable of the maintainer scripts,
+naming the package to which the script belongs, and this will be used
+by default).
+
+=item B<--no-await>
+
+This option arranges that the calling package I<T> (if any) need not await
+the processing of this trigger; the interested package(s) I<I>, will not be
+added to I<T>'s trigger processing awaited list and I<T>'s status is unchanged.
+I<T> may be considered installed even though I<I> may not yet have
+processed the trigger.
+
+=item B<--await>
+
+This option does the inverse of B<--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.
+
+=item B<--no-act>
+
+Just test, do not actually change anything.
+
+=back
+
+=head1 EXIT STATUS
+
+=over
+
+=item B<0>
+
+The requested action was successfully performed.
+Or a check or assertion command returned true.
+
+=item B<1>
+
+A check or assertion command returned false.
+
+=item B<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.
+
+=back
+
+=head1 ENVIRONMENT
+
+=over
+
+=item B<DPKG_ROOT>
+
+If set and the B<--root> option has not been specified, it will be used as
+the filesystem root directory (since dpkg 1.21.0).
+
+=item B<DPKG_ADMINDIR>
+
+If set and the B<--admindir> option has not been specified, it will
+be used as the B<dpkg> data directory.
+
+=item B<DPKG_DEBUG>
+
+Sets the debug mask (since dpkg 1.21.10) from an octal value.
+The currently accepted flags are described in the B<dpkg --debug> option,
+but not all these flags might have an effect on this program.
+
+=item B<DPKG_COLORS>
+
+Sets the color mode (since dpkg 1.18.5).
+The currently accepted values are: B<auto> (default), B<always> and
+B<never>.
+
+=back
+
+=head1 SEE ALSO
+
+L<dpkg(1)>,
+L<deb-triggers(5)>,
+B<%PKGDOCDIR%/spec/triggers.txt>.