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/usr/bin/sync-accounts-createuser is in chiark-scripts 4.3.0.

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The actual contents of the file can be viewed below.

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#!/bin/sh
# $Id: sync-accounts-createuser,v 1.6 2007-09-21 21:21:15 ianmdlvl Exp $
#
# Copyright 1999-2002 Ian Jackson <ian@davenant.greenend.org.uk>
#
#  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 3, 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 already have a copy of the GNU General Public License.
#  If not, consult the Free Software Foundation's website at
#  www.fsf.org, or the GNU Project website at www.gnu.org.

set -e
un=$SYNCUSER_CREATE_USER
ui=$SYNCUSER_CREATE_UID
gi=$SYNCUSER_CREATE_GID
ho=$SYNCUSER_CREATE_HOME
test -d $ho || mkdir $ho
chgrp $gi $ho
chown $ui $ho
chmod 2755 $ho