Check if Screensaver is Active using Mac Bash Script Command

I've found many useful Bash commands that can execute OS X behaviors from the command line such as:

screencapture -x 开发者_如何学JAVA-C $FILENAME

Is there such a command that can check if the screen saver is active?

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I am using this:

ps ax|grep [S]creenSaverEngine > /dev/null
if [ "$?" != "0" ] ; then
    # screen saver is not active
else
    # screen saver is active
fi

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the screensaver in Mac is just an application, so possibly you could check if the process is running...

I think the process is named 'ScreenSaverEngine', but I'm not sure if this is true for the version you have :)

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My Mac is at home and I'm not, so I can't test this solution, but how about something like:

ps -ef | grep [s]creencapture > nul; echo $?

The [] brackets prevent grep from matching this grep command while allowing it to match all other commands containing "screencapture". (Assuming "screencapture" is the name of the process you're trying to detect.)