What would happen if I (remotely) ran a say command on a Mac that's logged out? Would the command run? Or wait until the user logs in to run?
Running Say Command When Mac Is Logged Out
terminal
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I'm not sure if this will work, but, it's worth a shot...
What is you create an Automator script to take a screen capture, and then run that using the terminal?
Similar to what is described in this TUAW article, however, without the part that mails the screen capture to you.
Save the Automator script as an application, SSH in, and run open /path/to/the/automator.app
A little Googling suggests that it's a new problem in 10.8.4. A couple people in this MacRumors forum thread have experienced the same, as has the author of this blog post. No indications as to how to get rid of it however.
I haven't seen any error when testing say, so it may be some combination of hardware that causes it, but if the sound output is as expected, I wouldn't worry too much about it, and it will probably be fixed eventually.
If you're using say in shell scripts and need the Terminal output cleaned up a bit, you could always pipe it through grep: say test | grep -v "MTBEAudioUnitSoundOutput::PropagateProperty Error -10851".
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Best Answer
You would either have to wake the computer first, or you'd be locked out if the settings in system preferences disallowed you from such a thing.