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In this movie, I want to show you a few of the most popular system configuration changes. The first one will show all the dot files in the Finder. Remember that by default the Finder hides all our dot files so that we can't see them, but we could change that behavior. If we want to make them visible we'd say defaults write com.apple. Finder and then ShowAllFiles true. If you ever decide you want to turn it off again, ShowAllFiles false. Or if you want the Unix path to display in the Finder windows up at the top, well its default is write com.apple. Finder, and then _FXShowPosixPathInTitle using all the correct capitalization, and then -bool TRUE, setting a Boolean to true.
If you wanted to go away then you'd just set it to bool False. We can also configure some of the defaults for screen capturing. We saw a little bit about how to trigger screen capturing from Unix. We can change how the Mac does its screen capturing permanently even in the Finder by setting defaults write com. apple.screen capture. Type is we can set a different file type. I have listed off most of them there for you. You could pick one of these and if you say, oh you know what I wish it would capture it and save it as a PDF file every time, well you can have it do that. You also change the location where it places that screen capture.
By default it's going to put it on your user's desktop, but if you use defaults write com.apple.screen capture location, then you can provide the path to where your documents save instead, so maybe you say I want to save it in /users/Kevin/pictures or /pictures/ screen captures. It can be whatever you want. The one caveat with that is that you do want to use a full file path. You don't use any kind of shortcuts like the till date, represent your user directory. Give it the full entire working path so that it can reliably find it.
And last of all you can change the background image for when you log into your Mac by using the defaults as well. You know the picture that I'm talking about? It's not the desktop picture that you get after you've logged in. This is the image that's behind that log-in screen. Currently there's not a way to change that image inside System Preferences. Maybe they'll make that possible in the future, but right now that's a hidden option. You can't change that picture. Well let's say you want to put your company logo in the background or something or pictures of your kids there, right behind the login screen, as soon as your computer comes up. You can. All you have to do is use defaults to change com.apple.loginwindow DesktopPicture to the path to the new picture that you want to change it to.
Notice that I've also used sudo in front of this one. That's because these defaults live in that system configuration, every user will get this preference, and so we need sudo to make that change system wide. Once again you want to provide a full path. Don't have any shortcuts to it. Now a lot of people have resorted to a low-tech version of making the same change and that is they go into their library of desktop pictures and they move Aqua Blue.jpg out-of-the-way and they put whatever image they want in its place within name Aqua Blue.jpg. That's bad for a number of reasons.
First of all now Aqua Blue is no longer there if you need it for something else and your other image is mislabeled. It's better to do at this way with the preferences. And so you can just change it to this, and if you want to change it back to Aqua Blue later, you just change the preference again. So you can see the increase level of power and control that Unix gives you over your Mac. Not only can you do really powerful cool things in Unix but you actually can get under the hood of your Mac and make changes to the way that it works as well.
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