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diff --git a/src/mailman/commands/cli_inject.py b/src/mailman/commands/cli_inject.py
new file mode 100644
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+++ b/src/mailman/commands/cli_inject.py
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+# Copyright (C) 2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman 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 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman 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
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Module stuff."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'Inject',
+    ]
+
+
+import sys
+
+from zope.component import getUtility
+from zope.interface import implements
+
+from mailman.config import config
+from mailman.i18n import _
+from mailman.inject import inject_text
+from mailman.interfaces.command import ICLISubCommand
+from mailman.interfaces.listmanager import IListManager
+
+
+
+class Inject:
+    """Inject a message from a file into a mailing list's queue."""
+
+    implements(ICLISubCommand)
+
+    name = 'inject'
+
+    def add(self, parser, command_parser):
+        """See `ICLISubCommand`."""
+        self.parser = parser
+        command_parser.add_argument(
+            '-q', '--queue',
+            type=unicode, help=_("""\
+            The name of the queue to inject the message to.  QUEUE must be one
+            of the directories inside the qfiles directory.  If omitted, the
+            incoming queue is used."""))
+        command_parser.add_argument(
+            '-s', '--show',
+            action='store_true', default=False,
+            help=_('Show a list of all available queue names and exit.'))
+        command_parser.add_argument(
+            '-f', '--filename',
+            type='string', help=_("""
+            Name of file containing the message to inject.  If not given, or
+            '-' (without the quotes) standard input is used.
+            """))
+        # Required positional argument.
+        command_parser.add_argument(
+            'listname', metavar='LISTNAME', nargs='?',
+            help=_("""\
+            The 'fully qualified list name', i.e. the posting address of the
+            mailing list to inject the message into."""))
+
+    def process(self, args):
+        """See `ICLISubCommand`."""
+        # Process --show first; if given, print output and exit, ignoring all
+        # other command line switches.
+        if args.show:
+            print 'Available queues:'
+            for switchboard in sorted(config.switchboards):
+                print '   ', switchboard
+            return
+        # Could be None or sequence of length 0.
+        if args.listname is None:
+            self.parser.error(_('List name is required'))
+            return
+        assert len(args.listname) == 1, (
+            'Unexpected positional arguments: %s' % args.listname)
+        fqdn_listname = args.listname[0]
+        mlist = getUtility(IListManager).get(fqdn_listname)
+        if mlist is None:
+            self.parser.error(_('No such list: $fqdn_listname'))
+            return
+        queue = ('in' if args.queue is None else args.queue)
+        switchboard = config.switchboards.get(queue)
+        if switchboard is None:
+            self.parser.error(_('No such queue: $queue'))
+            return
+        if args.filename in (None, '-'):
+            message_text = sys.stdin.read()
+        else:
+            with open(args.filename) as fp:
+                message_text = fp.read()
+        inject_text(mlist, message_text, switchboard=queue)