Energy saving script: stops automatically a NAS server after an inactivity delay (no ssh client, no samba client as well).

auto-stop-nas.sh

#!/bin/bash

## Cron this every minute so that it runs as root

FLAG_FILE="/home/yann/.no_client.flg"
SVG_FLAG="/home/yann/.backup.flg"
SHUTDOWN_DELAY=15

# Remove file flag if any user is connected and exit
if [ $(who -T | wc -l) != 0 ]; then
        rm -f $FLAG_FILE
        logger "Auto-Stop : There are users connected."
        exit 0
fi

# Remove file flag if any samba client is connected and exit
if [ $(smbstatus --shares | grep 192 | wc -l) != 0 ]; then
        rm -f $FLAG_FILE
        logger "Auto-Stop : There are samba clients."
        exit 0
fi

echo $(date) - there is no activity. Touching the flag. >> $LOG_FILE
touch -a $FLAG_FILE

# Skip if backup is on the run
if [ -f $SVG_FLAG ]; then
        logger "Auto-Stop : Backup is on the run."
        exit 0
fi

# Stop the system automatically if the flag is older than X minutes
if test `find $FLAG_FILE -mmin +$SHUTDOWN_DELAY`; then
        logger "Auto-Stop : Stopping system. There was no client for $SHUTDOWN_DELAY minutes."
        rm -f $FLAG_FILE
        /sbin/shutdown -P now
fi

exit 0