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Using Cron to schedule software updates on Mac 0Sx 10.7.5

I am currently attempting to set up a group of 14 iMacs running 10.7.5 so that they do the following: Every weekday, turn on at 7 AM and turn off at 7 pm. (This I am able to do with the energy saver utility in system preferences). This is where it gets trickier. Ideally, I would like the iMacs to turn on at 3 AM on a saturday, and then run a simple script I've written that installs all available software updates, and then shuts down. However, neither energy saver or pmset (the unix command) allows multiple turn on and shut down points.

The partial solution I have is setting the iMacs to turn on at 7 AM every day, and have a cronjob to turn them off every weekday at 7 PM. Then, have  my original cronjob that runs my script at 8 AM every Saturday, and one final cronjob that cleans up the loose end of Sunday by turning off every Sunday at 8 AM. The problem is that the iMacs are on for an hour every Sunday, which seems unclean to me. Any suggestions?
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CompassTech
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CompassTech
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s3e3Commented:
I like using the Apple Remote Desktop 3 for software updates and network remote control. I know there is a cost to it but it saves on headaches and lowers overall maintenance.
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CompassTechAuthor Commented:
For anyone who wants to know, the solution I settled on was using pmset to turn on every day except Sunday at 7 am, and turn off every day except Sunday and Saturday at 7 PM. Then a cron job was set up to run my script every saturday at 8 am. (The script shut's down the computer when it is done). This isn't exactly what I was going for, but it works well.
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CompassTechAuthor Commented:
I found a solution on my own.
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