/usr/lib/shape/user_at is in shapetools 1.4pl6-11.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #!/bin/sh
#
## Copyright (C) 1993,1994 by the author(s).
#
# This software is published in the hope that it will be useful, but
# WITHOUT ANY WARRANTY for any part of this software to work correctly
# or as described in the manuals. See the ShapeTools Public License
# for details.
#
# Permission is granted to use, copy, modify, or distribute any part of
# this software but only under the conditions described in the ShapeTools
# Public License. A copy of this license is supposed to have been given
# to you along with ShapeTools in a file named LICENSE. Among other
# things, this copyright notice and the Public License must be
# preserved on all copies.
#
# Author: Andreas Lampen (Andreas.Lampen@cs.tu-berlin.de)
#
# $Header: user_at[6.0] Fri Jun 25 17:01:34 1993 andy@cs.tu-berlin.de frozen $
#
if [ -f /bin/domainname ];
then
domain=`/bin/domainname | sed -e 's/^\.//' | sed -e 's/^+//'`
else
domain=`hostname`
fi
echo $USER@$domain
|