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Jan 16, 2020 Go to the General tab and select Sync Library to turn it on. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on Sync Library. If you have a large music library, it might take some time to upload and sync your music library across all of your devices. Using the first version of macOS Sierra 10.12 (Build 16A323), released on September 20, 2016 via the Mac App Store: $ ruby -version ruby 2.0.0p648 (2015-12-16 revision 53162) universal.x8664-darwin16 This is on a fresh install without Xcode installed. All users on any version of Sierra should have at least this version of Ruby available. NEW STUDENTS - Use this page to find your computer login account information. After you have your information see below MAC Student Account/Computer Information and MAC Online Registration Directions. You can also get your MyMac on any Apple or Android device. Search the app store or android play store for 'myMac Mobile'.
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I've deleted a system file from my Mac and need to get it back. System files can include: hidden files in the root of / - especially unix files in /private /System files /Library files /Applications files that ship with the core OS; System files are not any app, user files or files that can be regenerated by a known sequence such as cache files, Spotlight index files, etc. Sep 21, 2015 The installation problem occurs because OS X ships with a copy of Ruby in /Library/Ruby, a directory which is owned and controlled by the OS. In past versions of OS X, a new jekyll user could use sudo gem install jekyll to install software into this directory. That may not be possible in OS X 10.11, because Apple is now using System Integrity Protection (SIP) to further restrict write access to some. Your Apple ID is the account you use for all Apple services. Jul 16, 2009 Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
Here's what you need
- Update your iPhone or iPod touch to the latest version of iOS, iPad to the latest version of iPadOS, or Mac to the latest version of macOS. On a PC, make sure that you have the latest version of iTunes for Windows.
- Subscribe to Apple Music or iTunes Match.
- Sign in to all of your devices with the same Apple ID that you use with Apple Music or iTunes Match.
- Connect your devices to the Internet over a Wi-Fi or cellular network. On a Mac or PC, you can also connect to the Internet using Ethernet.
Apple Music and iTunes Match availability varies by country or region. Learn what's available in your country or region.
Turn on Sync Library
With the latest version of iOS, iPadOS, and macOS, Sync Library is turned on by default. If you turned off Sync Library, you can turn it back on. Just follow the steps below for your device.
On your iPhone, iPad, or iPod touch
- Go to Settings > Music.
- Turn on Sync Library. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on Sync Library.
If Sync Library is updating or turned off, you'll see a message at the top of the Library tab in the Apple Music app.
On your Mac
- Open the Apple Music app.
- From the menu bar at the top of your screen, choose Music > Preferences.
- Go to the General tab and select Sync Library to turn it on. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on Sync Library.
- Click OK.
If you have a large music library, it might take some time to upload and sync your music library across all of your devices.
On your PC with iTunes for Windows
In iTunes for Windows, iCloud Music Library isn't turned on by default. To turn on iCloud Music Library:
- Open iTunes.
- From the menu bar at the top of your screen, choose Edit > Preferences.
- Go to the General tab and select iCloud Music Library to turn it on. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on iCloud Music Library.
- Click OK.
If you have a large music library, it might take some time to upload and sync your music library across all of your devices.

On other devices
If you subscribe to Apple Music, you can also access your music library — without having to turn on Sync Library — on other devices that support the Apple Music app.
If you don't subscribe to Apple Music
- If you only want to sync your existing music library across all of your devices, and not any music from the Apple Music catalog, you can subscribe to iTunes Match on your computer. iTunes Match lets you access your music library on any Apple device or a PC with iTunes for Windows.
- If you buy music from the iTunes Store, you can redownload your past music purchases on your Apple device or a PC with iTunes for Windows.
- You can also manually sync music from your computer to your iPhone, iPad, or iPod touch.

Need help?
- If you sign out of your Apple ID or cancel your Apple Music or iTunes Match subscription, you won’t be able to access and sync your music library on all of your devices. The original song files will remain on the device that they were uploaded from.
- Apple Music isn't a back up service. Make sure to back up your iPhone, iPad, iPod touch, Mac, or PC, so that you have a copy of your music and other information in case your device is ever replaced, lost, or damaged.
- You can have up to 100,000 songs in your music library. Songs that you buy from the iTunes Store don't count against this limit.
- If a song is grayed out, incorrect music plays, or you can’t access your music library, learn what to do.
Learn more
- Learn how to join Apple Music.
- Learn about the icons that you might see next to songs when you turn on Sync Library.
- If Sync Library is turned on, a song that you delete from one device is deleted everywhere.
- Learn what to do if songs in your music library are grayed out.
To combine Photos libraries, open the source library and export the photos and videos that you want to keep. Then open the destination library (the one that you want to use as your main library) and import the photos and videos.
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Choose a photo library
Here's how to open one of the multiple photo libraries that you might have on your Mac or on a connected external drive:
- Press and hold the Option key as you open the Photos app.
- Select the library that you want to open, then click Choose Library.
Photos uses this library until you open a different one using the same steps.
Export photos and videos from the source library
Open the source library, then decide whether you want to export your files as unmodified originals or edited versions:
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Edited versions retain their edits when you import them. The advantage is that you don't have to recreate any edits; however, these files become the destination library's originals. This means that you can't revert to their earliest pre-import version.
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Unmodified originals don't show any edits that you made when they were in the source library. This gives you flexibility for later editing, but recreating your edits might take substantial work.
How to export edited versions
- In the Photos app, select the photos and videos that you want to export. To select multiple items, press and hold the Command key while you click. To select a group of items in order, click the first one, then press and hold the Shift key while you click the last one. This selects all of the items between the two that you clicked.
- Choose File > Export > Export [number].
- An export dialog appears.
- In the Photos section, set Photo Kind to JPEG, TIFF, or PNG. JPEG recompresses your photos, which may result in smaller file sizes. TIFF and PNG files are higher fidelity and may result in larger file sizes.
- In the Videos section, choose a Movie Quality setting. This section appears only if your selected items include videos.
- In the Info section, select the checkboxes if you want to preserve metadata and location data in the exported files.
- In the File Naming section, set File Name to Use File Name and set Subfolder Format to either Moment Name or None. Moment Name creates a subfolder for each Moment that's represented in your selected items. This is useful if you'd like to create an Album in the destination library for each Moment. The None option exports all of the files directly into the destination folder.
- Click Export. A Finder dialog appears.
- Navigate to the location where you want to save the files, such as the Desktop or an external drive. Click New Folder if you create a new folder for your exported items.
- Click Export.
How to export unmodified originals
- In the Photos app, then select the photos and videos that you want to export. To select multiple items, press and hold the Command key while you click. To select a group of items in order, click the first one, then press and hold the Shift key while you click the last one. This selects all of the items between the two that you clicked.
- Choose File > Export > Export Unmodified Original.
- An export dialog appears.
- If your photos include IPTC metadata (such as titles or keywords) that you want to keep, select the Export IPTC as XMP checkbox.
- Leave the File Name setting on Use File Name.
- Next to Subfolder Format, choose Moment Name or None. Moment Name creates a subfolder for each Moment that's represented in your selected items. This is useful if you'd like to create an Album in the destination library for each Moment. The None option exports all of the files directly into the destination folder.
- Click Export. A Finder dialog appears.
- Navigate to the location where you want to save the files, such as the Desktop or an external drive. Click New Folder if you create a new folder for your exported items.
- Click Export Originals.
How to import photos and videos into the destination library
Open the destination library, then drag the folder that contains your exported items into the main area that shows your other photos and videos. When a green plus sign appears on your pointer, you can release the folder.
The photos in the folder are sorted into Moments based on their creation dates and locations. The videos are sorted based on the date you exported them from the source library.
If you created subfolders when you exported the items and you want to create an Album for each subfolder, follow these steps:
- In the Finder, open a subfolder.
- Select all of the photos and videos within the subfolder.
- Drag the items onto My Albums in the Photos sidebar.
- Name the Album in the highlighted text box that appears in the sidebar.
- Repeat for each subfolder.
Save space by deleting the source library
If you're sure that you've exported all of the photos and videos that you want to keep from the source library, you can delete it to save disk space on your Mac.
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First, open the Finder and find the source library that you want to delete. By default, photo libraries are stored in your Pictures folder. If you can't find the library, follow the steps to choose a library; the path to the selected library's location appears in the Choose Library window.
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Next, move the source library to the Trash. Then choose Finder > Empty Trash to permanently delete the files.
How to transfer my itunes library to another mac. Nov 18, 2014 Part 1: How to Transfer iTunes Library from Mac to Mac Often, Mac users will have more than one Mac in their home. It is the nature of the beast, as they may be so pleased with their exclusive Mac environment that there may suddenly be a MacBook or an iMac in the house where there may have been only one Mac computer previously. There are a few ways to transfer your iTunes library from one computer to another. When you get a new Mac, use Setup Assistant (or Migration Assistant, if you’re switching from Windows) to move files—including your iTunes files—from your old computer to the new one.