Energy Saver scripting

Here’s a version of a script we use on all our machines in an attempt to reduce energy usage with a minimum of visible impact on users. Our machines are set to not sleep during the day. This script runs hourly, and if it’s after 7pm and the machine has been idle for 20 minutes or more, it tries to sleep the machine if someone is logged in, or shut it down if no-one is logged in.
The machine is also set to automatically startup or wake at 6am M-F. The net result is that most of our desktop machines go to sleep or shutdown a little after 7pm each weeknight and wake up at 6am each week morning, and our users are none the wiser.

#!/bin/sh

# Sleep or shutdown script
# tryin' to be 'green'.....

# look for exception file
if [ -f "/var/db/.dontSleep" ]; then
	exit 0
fi

# if we're a laptop, exit.  
# No shutting down laptops (or waking them up unbidden!)
IS_LAPTOP=`/usr/sbin/system_profiler SPHardwareDataType | grep "Model" | grep "Book"`
if [ "$IS_LAPTOP" != "" ]; then
	exit 0
fi

# check the time; exit if it's between 5 am and 7 pm
current_hour=`/bin/date +%H`
if [ $current_hour -gt 5 -a $current_hour -lt 19 ]; then
	exit 0
fi

# now check idle time; 
# exit if we've been idle less than 20 minutes
idleTime=`ioreg -c IOHIDSystem | perl -ane 'if (/Idle/) {$idle=int((pop @F)/1000000000); print $idle,"\n"; last}'`
if [ $idleTime -lt 1200 ]; then
	exit 0
fi

# tell Power Manager to wake us up or turn us on at 6am M-F
pmset repeat wakeorpoweron MTWRF 06:00:00

# check to see if a user's logged into the console
login_status=`/usr/bin/who | /usr/bin/awk '{ print $2 }'`
for i in $login_status; do
  if [ $i = "console" ]; then
       # someone's logged in, sleep
       osascript -e 'tell application "System Events" to sleep'
       exit 0
  fi
done

# if we got this far, it's OK to shut down.
/sbin/shutdown -h now
exit 0

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