/usr/share/gnome-settings-daemon-3.0/input-device-example.sh is in gnome-settings-daemon 3.14.2-3+deb8u1.
This file is owned by root:root, with mode 0o644.
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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | #!/bin/sh
#
# This script is an example hotplug script for use with the various
# input devices plugins.
#
# The script is called with the arguments:
# -t [added|present|removed] <device name>
#       added ... device was just plugged in
#       present.. device was present at gnome-settings-daemon startup
#       removed.. device was just removed
# -i <device ID>
#       device ID being the XInput device ID
# <device name> The name of the device
#
# The script should return 1 if the device is to be
# ignored from future configuration.
#
# Set the script to be used with:
# gsettings set org.gnome.settings-daemon.peripherals.input-devices hotplug-command /path/to/script/input-devices.sh
#
args=`getopt "t:i:" $*`
set -- $args
while [ $# -gt 0 ]
do
    case $1 in
    -t)
        shift;
        type="$1"
        ;;
     -i)
        shift;
        id="$1"
        ;;
     --)
        shift;
        device="$@"
        break;
        ;;
    *)
        echo "Unknown option $1";
        exit 1
        ;;
    esac
    shift
done
retval=0
case $type in
        added)
                echo "Device '$device' (ID=$id) was added"
                ;;
        present)
                echo "Device '$device' (ID=$id) was already present at startup"
                ;;
        removed)
                echo "Device '$device' (ID=$id) was removed"
                ;;
        *)
                echo "Unknown operation"
                retval=1
                ;;
esac
# All further processing will be disabled if $retval == 1
exit $retval
 |