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Use dseditgroup to allow users access to services (ssh, screen sharing, and more) System
Want to add a user to a specific group using the command line? dseditgroup is your friend! Add users, or groups, to a group you create or system groups which control access to services.

Make sure to insert your local admin's short name (localadmin) and the user (username) or group (groupname) you're trying to add.

Remote Login (SSH)
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user com.apple.access_ssh
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group com.apple.access_ssh

Screen Sharing
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user com.apple.access_screensharing
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group com.apple.access_screensharing

Print Administrators
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user _lpadmin
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group _lpadmin

Explanation:
-o specifies the operation (edit in this case)
-n specifies the domain (another example is /LDAPv3/127.0.0.1 on an ODM)
-u is the admin user to authenticate with (use diradmin for network domains)
-p tells it to prompt for a password
-a tells it to add a user or group
-t specifies the type, user or group
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Shell script to delete all printers Printers
The following shell script will delete all printers. Make sure the file is executable after you create it (chmod ugo+x /path/to/delPrinters.sh).


#!/bin/sh

for printer in `lpstat -p | awk '{print $2}'`
do
echo Deleting $printer
lpadmin -x $printer
done
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Use AppleScript and Remote Desktop to set a non-default NetBoot startup disk OS X Server
The following AppleScript will use Remote Desktop to set a non-default NetBoot image as the startup disk. Make sure to insert your server's IP Address and the image name...

tell application "Remote Desktop"
	set theServer to "192.168.1.8"
	set theImage to "10.8.5 NetBoot"
	set theComputers to the selection
	set theTask to make new set network startup disk task with properties {from server:theServer, mount volume:theImage, restarting:true}
	execute theTask on theComputers
end tell
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Let VNC viewers connect to currently logged in user Network
Want to connect with the currently logged in user when using a VNC viewer rather than seeing the Login Window (ARD 3.5/OS X 10.7 and later)?

sudo defaults write /Library/Preferences/com.apple.RemoteManagement VNCAlwaysStartOnConsole -bool true
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Pinch and zoom the cover art album browser in the Music app iOS devices
When you turn your iOS 7 device to landscape (horizontal) mode in the Music app, you get a lovely grid of album cover art from the music in your library. You can tap on one to see that album in details.

But you may not realize just how interactive that grid is. You can swipe across it to drag other album covers into view. But even better, you can pinch and zoom to change how many album covers fit onto the screen at a time.
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Let Siri give a random number iOS devices
Siri can returna random number, letter, or word.

After reading Lex's hint about rolling the dice and flipping a coin, I decided to see whether Siri can generate random numbers. It can have Wolfram do it. You can speak "random number" (which it interprets as "random integer"), "random integer", or "random real". You can also specify ranges, such as "random number between ten and 100" or "random real between 20 and 30".

"Random word" and "random letter" also work.
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Roll the dice or flip a coin with Siri iOS devices
Over at Finer Things, David Chartier points out that Siri can help you play games of chance. Unfortunately, however, the virtual assistant can't necessarily help you win at said games. Still, you can use Siri when you need to flip a coin or roll a pair of dice.

Say "Flip a coin," and Siri will either announce that it's heads or tails. Ask Siri to "roll the dice," and you'll get a pair of numbers between one and six. You can't ask Siri to roll a single die. Or rather, you can, but you'll still get two numbers back.

Hardcore role playing game enthusiasts will need a separate app or actual dice hardware to roll dice with more than six sides; Siri's apparently not into D&D.
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Use TextEdit in native Full Screen mode Apps
Do you love TextEdit for its simplicity and elegance? Have you ever thought that it'd be great to use it in full screen mode? Here's how to achieve that. Apple has released TextEdit's source code as an example of an Xcode project; with Xcode installed, you'll be able to manufacture a version of TextEdit with full screen support.

Open TextEdit.xcodeproj and on the left, find the Interfaces folder and select the file DocumentWindow. Then, select the window; make sure you select the window itself and not one of the objects contained in it. On the right, you can see the different inspectors Xcode provides. You'll want to select the fourth, the Attributes inspector. There are a lot of changeable attributes of the window available, but what we're interested in is the full screen support. Change that to "Primary Window". Build and run the application. Presto, you have full screen support!

To get the finished, executable application, locate "TextEdit.app" in the folder "products", right click on it and "Show in Finder". You can move or copy it to a place of your choice - you might wanna keep the original TextEdit application, just to be safe though.
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Make Do Not Disturb on iOS 7 work even when your device is awake iOS devices
iOS 6 introduced Do Not Disturb, but some of us were annoyed by its implementation: Though the feature silenced iOS notification sounds while your iPhone or iPad were sleeping, those noises still blasted out when the device was in use. If that's not what you want to have happen, iOS 7 has the solution.

Armed with this hint, Do Not Disturb will empower you to use your iOS device in a room with sleeping people, or in a meeting where you're supposed to be paying attention, without fear that a bleep or bloop will bother those around you.

Head over to the Settings app, and tap on Do Not Disturb. Scroll down to the bottom of the screen, and set Silence to Always, instead of Only While iPhone Is Locked. From now on, Do Not Disturb works regardless of whether your iPhone is awake and in use, whenever the mode is enabled.
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Make Messages on iOS 7 show full names iOS devices
iOS 7's new design seemed to cause some spacing issues in Messages, especially on the iPhone. Where you formerly could see the full names of the people you texted, iOS 7 shows only a first name, or perhaps a first name and last initial. When you know as many Dans as I do—even as many Dan M.'s as I do—that just won't do.

There's a fix, though the setting isn't where you might expect.

In the Settings app, tap on Mail, Contacts, Calendars. and then scroll way down to the Contacts section. Under that header, tap on Short Name. For my purposes, I turned off both Short Name and Prefer Nicknames. Now, Messages shows the full names of the contacts I'm sending messages to, shortening the button labels at the top as necessary to make everything fit.
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