How to control automatic downloads for music, books, and apps.

If you have an iPhone and iPad, or a Mac, iCloud can automatically download any music, books, or apps you buy on one device onto any or all of the others. For example, if you downloaded a hot new game on your iPad, you can have it automatically appear on your iPhone (assuming the game is also iPhone-compatible). Purchase a classic song while out and about on your iPhone? You can make sure it's on your Mac when you get home.

It's incredibly convenient if you want everything anywhere and like living on automatic. If you use your devices differently and prefer to keep the distinct, however, you may want to set things to manual.

Luckily, the choice is yours—all you have to do is flick a few switches in Settings.

Automatic download details

iOS offers several types of automatic downloads:

• Music: If you purchase a song from iTunes, it'll automatically be available on any compatible iPhone, iPad, iPod, or Mac that supports iCloud and is authorized to use your iTunes account.
• Apps: Apps downloaded on one device are automatically downloaded to any other compatible device that has an active connection to the internet. Some iOS apps are universal and will download to both iPhone and iPad. Mac and iOS apps, on the other hand, aren't cross-compatible and will never automatically download to both.
• Books: If you download a book in iBooks, it should automatically appear in your other instances of iBooks on iOS and OS X.
• Updates: Updates are a little different, and will only apply on a per-device basis. Turn updates on if you want App Store updates to install automatically, without you having to first approve them via the App Store app. 

How to turn on automatic downloads for music, books, and apps on your iPhone and iPad

1. Launch the Settings app on your iPhone or iPad. 
2. Tap on iTunes & App Store.
3. Under the Automatic Downloads section, turn On the options for the types of content you'd like to download automatically.
   
   

To disable Automatic Downloads, follow the same steps, but turn the appropriate switch Off.

How to turn off automatic downloads over cellular data

Having your automatic downloads happen no matter where you are, even off Wi-Fi and out and about on LTE or 3G can be incredibly convenient, but it can also eat away at your data plan. If that's something you want to avoid, you can easily turn off automatic downloads over cellular.

1. Launch the Settings app on your iPhone or iPad. 
2. Tap on iTunes & App Store.
3. Under the Automatic Downloads section, turn Off the option for Use Cellular Data. 

Automatic downloads will still happen, but only when you're on Wi-Fi.

How to downgrade from OS X El Capitan back to OS X Yosemite

If you decide the OS X El Capitan public beta just isn't for you, you can downgrade to OS X Yosemite.

The OS X El Capitan public beta is a way to test the next generation of Mac software. If it turns out you don't enjoy the process, or would prefer to wait and try again later, you can go back to OS X Yosemite. Downgrading is a simple process, but it's also a bit of a chore. Don't worry, though, we'll walk you through it!

Note: If you're reading this article on the Mac you want to revert, either print it out first, or open it on iPhone, iPad, or another Mac so you can read along as you go.

If you made a bootable OS X Yosemite install drive before you went on the El Capitan beta, then simply plug it in, reboot, hold down the Option key, and you'll be on your way.

If not, you'll need to erase OS X El Capitan first, and then re-install.

• How to erase OS X El Capitan
• How to reinstall OS X Yosemite
• How to restore your data from Time Machine

How to erase OS X El Capitan

1. Make sure your Mac is connected to the internet over W-Fi or Ethernet.
2. Go to the  menu and select Restart....
3. Hold down Command+R while your Mac reboots.
4. Click on Disk Utility in the OS X Utilities selector.
5. Click Continue.
   
   
6. Select your Startup Disk.
7. Click on the Erase tap.
8. Type in Macintosh HD for the name (or whatever you like.)
9. Select Mac OS Extended (Journaled)* from the **Format list, if it isn't selected already.
10. Click Erase.
    
    

Once it's done, quit Disk Utility and get ready to reinstall.

How to reinstall OS X Yosemite

1. Click on Reinstall OS X in the OS X Utilities selector.
2. Click Continue on the OS X Yosemite Installer.
   
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From this point on it's the same as a standard update, simply continue on and agree to the licensing terms as you go. When you're done, your Mac will reboot into OS X Yosemite.

Note: Depending how old your Mac is, you may get an older version of the installer—typically the one that originally shipped on your Mac (That's especially true if you end up in Internet Recovery mode).

If that happens, complete the installation of Lion, Mountain Lion, Mavericks, or whichever version you're offered, and when you're done and rebooted, go to the Mac App Store and re-run the OS X Yosemite update.

How to restore your data from Time Machine

You should be asked if you want to restore from Time Machine as part of the reinstallation process. If not, or if you choose not to, you can restore at any time.

1. Power up or restart your Mac.
2. Hold down Command+R while your Mac boots.
3. Click Restore from Time Machine Backup from the OS X Utilities menu.
4. Click Continue.
5. Read the  Restore Your System page and click Continue.
6. Select your Time Machine backup
7. Click Continue.
8. Select the most recent backup of your drive and click Continue. 

Your Mac will then restore from Time Machine and reboot. The process can take a while so, depending on network speeds and the amount of data, so be patient.

If you run into any trouble or have any questions, ask away in the comments!

Swift - Interactive playgrounds

Swift. A modern programming language that is safe, fast, and interactive.

Interactive Playgrounds

Playgrounds make writing Swift code incredibly simple and fun. Type a line of code and the result appears immediately. You can then Quick Look the result from the side of your code, or pin that result directly below. The result view can display graphics, lists of results, or graphs of a value over time. You can open the Timeline Assistant to watch a complex view evolve and animate, great for experimenting with new UI code, or to play an animated SpriteKit scene as you code it. When you’ve perfected your code in the playground, simply move that code into your project.

And new in Xcode 7, playgrounds can contain comments that use rich text with bold, italic, and bullet lists in addition to embedded images and links. You can even embed resources and supporting Swift source code in the playground to make the experience incredibly powerful and engaging, while the visible code remains simple. Playgrounds let you:

• Share curriculum to teach programming with beautiful text and interactive code.
• Design a new algorithm and watch its results every step of the way.
• Create new tests and verify they work before promoting into your test suite.
• Experiment with new APIs to hone your Swift coding skills.
• Turn your experiments into documentation with example code that runs within the playground.

Read-Eval-Print-Loop (REPL). The LLDB debugging console in Xcode includes an interactive version of the Swift language built right in. Use Swift syntax to evaluate and interact with your running app, or write new code to see how it works in a script-like environment. Available from within the Xcode console or in Terminal.

Learn More: https://developer.apple.com/swift/#playgrounds

Manage Apple Music Membership

Join on your Mac or PC

1. Open iTunes. Make sure that you have the latest version.
2. In the upper-left corner, click the Music  icon.
3. From the top of iTunes, click For You.
4. Click Start 3-Month Free Trial.
5. Select Individual or Family membership, then click Next.
6. If prompted, enter your Apple ID and password that you use with the iTunes Store. If you don't have an Apple ID, click Create Account.
7. You might be asked to validate your billing info. After you add a payment method, click Join. You can use store credit to pay for your Apple Music membership, but you must have enough store credit for your first renewal.
8. If prompted, agree to the terms and conditions.

More details wise.

Click to open iTunes and sign in to your Account Information, or use the steps below:

1. Open iTunes.
2. Click Sign In and enter your Apple ID.
3. Click your name, and select Account Info from the menu.
4. Enter your password again.
5. On the Account Information screen:
1. Scroll to the Settings section. 
2. To the right of Subscriptions, click Manage. If you have more than one subscription, then click Edit to the right of Your Membership (Apple Music Membership). 
3. To the right of Automatic Renewal, select Off. When asked to confirm, click Turn Off.
4. Click Done to return to Account Information, and then click Done to return to the iTunes Store.

On your iPhone, iPad, or iPod touch:

1. In Settings, tap Music.
2. Turn on Show Apple Music.
3. Tap Join Apple Music.
4. Tap the For You tab, and then tap Start 3-Month Free Trial. 

Visit: https://support.apple.com/en-us/HT204939

Terminal Commands

cd

change directory



chown

change ownership



chmod

change permission modifiers



cp

copy a file or directory



sudo

DANGER! become super user root DANGER!



xargs

execute arguments



exit

exit the shell



export

export/set a new environment variable



find

find files



grep

find things inside files



apropos

find what man page is appropriate



ls

list directory



env

look at your environment



mkdir

make directory



mv

move a file or directory



                    hostname

my computer's network name



less

page through a file



popd

pop directory



echo

print some arguments



cat

print the whole file



pwd

print working directory



pushd

push directory



man

read a manual page



rmdir

remove directory

How to mount an AirPort Extreme USB hard disk volume in Mac OS X and Windows

This article explains how to mount an AirPort Extreme USB hard disk volume in Mac OS X and Windows.

Typically, when a USB disk is connected to an AirPort Extreme Base Station (802.11n), it will automatically become available to users of the network. However, if that option is disabled in AirPort Disk Utility (Mac OS X) or AirPort Disks (Windows), or the network user declines, it can still be accessed using any of appropriate steps below. By default, a user can access the AirPort Extreme Base Station (802.11n) over IP by entering the IP address 10.0.1.1. 

If you are unsure of the IP address of your AirPort Extreme (802.11n), use AirPort Utility (Mac OS X) or AirPort Disks (Windows) to select your base station. You will see its IP address in the main window.

Note: AirPort Disk Utility is located in the Utilities folder in the Applications folder on a Mac; AirPort Disks is located in Start > All Programs > AirPort on a computer using Microsoft Windows. Open it, or click the AirPort Disk menu bar icon () in Mac OS X, then select the AirPort Extreme Base Station (802.11n) to which the USB hard drive is connected.

Mac OS X

Automatically mounting hard disks

1. From the main window of AirPort Disk Utility enable "Show AirPort Disks in the menu bar".
2. Enter the username and password required to access the AirPort Disk(s).

Manually mounting hard disks using the AirPort Disk menu bar item

1. Click the AirPort Disk menu bar icon () and select the Base Station with desired USB hard drive.
2. Select the desired hard disk(s) (AirPort Disk).
3. Enter the username and password required to access the AirPort Disk(s).

Manually mounting Mac OS Extended (HFS+) volumes

1. From the Finder's Go menu choose Connect to Server.
2. Enter the AirPort Extreme Base Station's LAN IP address (by default 10.0.1.1).
3. Enter the username and password required to access the AirPort Disk(s).
4. Select the desired AirPort Disk(s) from the available Volumes.

Manually mounting FAT16/FAT32 volumes

1. From the Finder's Go menu choose Connect to Server.
2. Enter the AirPort Extreme Base Station's LAN IP address preceded by smb:// (for example, smb://10.0.1.1 )
3. Enter the username and password required to access the AirPort Disk(s). Leave the Workgroup field empty unless you have assigned one in AirPort Utility.
4. Select the desired AirPort Disk from the available CIFS (Common Internet File System) volumes

Windows XP and Vista

Note: With AirPort Base Station Update 2007-002 or later, AirPort Disk Agent has been renamed to AirPort Base Station Agent. If you have not installed this update yet, substitute AirPort Disk Agent for AirPort Base Station Agent in the steps below.

Mounting using AirPort Base Station Agent

1. Launch the AirPort Base Station Agent from C:\\Program Files\AirPort\
2. Ensure that the task bar menu is enabled from AirPort Disks
3. Click the AirPort Base Station Agent icon in the Taskbar
4. Enter the user name and password

Mounting by mapping a Network Drive

1. Go to My Computer (Start > My Computer)
2. From the menu, pull down Tools and select "Map Network Drive"
3. Enter a drive letter that is not in use (for example, "Z")
4. Enter the path to the drive. This is formatted as: \\IPaddress\drivename (for example, \\10.0.1.1\mydrive)

Mounting using Server Connection

1. Select Start > Run and enter the IP address of the AirPort Extreme Base Station (802.11n). (by default \\10.0.1.1)
2. When prompted, enter a username and password
3. A window will open containing folders for each hard drive connected to the AirPort Extreme Base Station (802.11n)

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.

Ref: http://support.apple.com/en-us/HT1331