/usr/share/cairo-dock/plug-ins/netspeed/netspeed is in cairo-dock-plug-ins-data 3.3.99.beta1.2.really.3.3.2-0ubuntu2.
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 | #!/bin/bash
# Compiz check for Cairo-Dock
#
# Copyright : (C) 2009 by Rémy Robertson
# E-mail : fabounet@glx-dock.org
#
#
# This program 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 program 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.
# http://www.gnu.org/licenses/licenses.html#GPL
rm -f /tmp/netspeed
#Il est pas beau mon script hein ^^
cat /proc/net/dev | sed -e '{1d;2d;3d}' -e "s/:/é/g" -e "s/ /_/g" -e "s/_*\(.*\)é_*\([0-9][0-9]*\)__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*\([0-9][0-9]*\)__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*__*[0-9][0-9]*/\1>\2>\3/" > /tmp/netspeed
echo time >> /tmp/netspeed
date +%s%N >> /tmp/netspeed
echo stop >> /tmp/netspeed
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