Monitor mouse movement. If mouse hasn't moved in a set period of time within certain window, shut down the box.

mousewatcher.sh

#!/bin/bash

# ---------------------------------------------------------------------------#
# Mousewatcher v1.2
#  Monitor user activity and shutdown machine if no activity detected.
#
# 24/05/2010 - Tom Latham
#
# Explanation:
# * Log output of /dev/input/mice to file. Monitor timestamp of file to
#    determine user activity. If file is not modifed for a specified
#    period of time whilst outside of core hours, shutdown machine.
# * Supercedes Mousewatcher v0.5. Interrupt handling proved to be unusable
#    for devices connected via USB due to shared handlers for USB devices.
# * No keyboard monitoring required.
#
# Changelog:
# v1.0 - 22/04 (TAL) - Test logging of mouse activity.
# v1.1 - 27/04 (TAL) - Added: out of hours window and shutdown event.
# v1.2 - 24/05 (TAL) - Added: movement threshold to ignore false positives.
# ---------------------------------------------------------------------------#

WAIT=30m #Set period between checks
LIMIT=4 #Number of checks to wait before shutdown. Example: Inactivity for 4x30m = 2hr, causes shutdown.
LOGFILE=/var/log/mousewatcher.log #Set log file for program execution
MOUSEFILE=/var/log/mousemovement.log #Set log file for mouse movement
UPPER=18:00:00 #Upper boundary of time window
LOWER=06:00:00 #Lower boundary of time window
THRESHOLD=200 #Movement threshold

echo "`date` - Test period set to $WAIT. Monitoring activity..." > $LOGFILE #Create log file

monitor_mouse()
{
 # -------------------------------------------------------------------------#
 # Create log file of mouse movement. Return start time of mouse logging.
 # -------------------------------------------------------------------------#

    rm $MOUSEFILE; cat /dev/input/mice > $MOUSEFILE &
    local start=$(date +%s); echo "$start"
}

get_time()
{
 #--------------------------------------------------------------------------#
 # Return current time in readable format. For use in execution logging.
 #--------------------------------------------------------------------------#

    local now=$(date +"%d-%m-%Y %T"); echo "$now"
}

get_lastmovement()
{
 #--------------------------------------------------------------------------#
 # Return last modified date of mouse log. This equates to last movement.
 #--------------------------------------------------------------------------#

    local last=$(date -r $MOUSEFILE +%s); echo "$last"
}

get_withinwindow()
{
 #--------------------------------------------------------------------------#
 # Compare current time with upper and lower boundary.
 # Return result of comparion (0=true, within time frame).
 #--------------------------------------------------------------------------#

    local upper=$(date -d $UPPER +%s)
    local lower=$(date -d $LOWER +%s)
    local now=$(date +%s)
    [[ now -gt lower && now -le upper ]]; echo $?
}

run_mousewatcher()
{
 #--------------------------------------------------------------------------#
 # Monitor mouse movement. If mouse not moved within specified time period
 #  (check period * limit) and time is outside of window, shut down box.
 #--------------------------------------------------------------------------#

    COUNT=0; sleep 1 #Wait one minute before starting monitoring to allow for changes during boot cycle.

    START=$(monitor_mouse)
    echo "$(get_time) - Monitoring started at: `date --date=@$START +"%d-%m-%Y %T"`." >> $LOGFILE

    while true #Repeat until exit
    do
        sleep $WAIT
        LAST=$(get_lastmovement)
        MOVEMENT=`stat -c %s $MOUSEFILE`
        echo "$(get_time) - Last movement at: `date --date=@$LAST +"%d-%m-%Y %T"`. Movement size: $MOVEMENT." >> $LOGFILE

        #If last modified time is not equal to start time then mouse activity detected. Reset monitoring.
        if [[ $LAST -ne $START && $MOVEMENT -gt 200 ]] ; then
            COUNT=0; START=$(monitor_mouse)
            echo "$(get_time) - Activity detected. Monitoring reset at: `date --date=@$START +"%d-%m-%Y %T"`." >> $LOGFILE
        else

            let COUNT+=1
            if [[ $COUNT -gt $LIMIT ]] ; then
                WINDOW=$(get_withinwindow)
                if [[ $WINDOW == 1 ]] ; then
                    echo "$(get_time) - No movement detected. Maximum time reached. Shutting down..." >> $LOGFILE
                    shutdown -h now #Shutdown machine
                else
                    echo "$(get_time) - No movement detected. Maximum time reached. During business hours, don't shut down." >> $LOGFILE
                fi
            else
                echo "$(get_time) - No movement detected. Check: $COUNT." >> $LOGFILE
            fi
        fi
        echo >> $LOGFILE
    done
}

run_mousewatcher & #Run mousewatcher as background process