Get_xattr_raw("~/Downloads/RStudio-1.2.627.dmg", ":kMDItemWhereFroms") This is the key Apple has standardized on to store the source URL of a downloaded item. There are four keys we can poke at, but the one that will help transition us to a larger example is :kMDItemWhereFroms. Library(tidyverse) # we'll need this later Library(reticulate) # not 100% necessary but you'll see why later We’re not going to work with the entire package in this post (it’s really straightforward to use and has a README on the GitHub site along with extensive examples) but I’ll use one of the example files from the directory listing above to demonstrate a couple functions before we get to the main example.įirst, let’s see what is hidden with the RStudio disk image: Let’s use the xattrs package to rebuild a list of download URLs from the extended attributes on the files located in ~/Downloads (if you’ve chosen a different default for your browsers, use that directory). We grab papers, data, programs (etc.) and some of those actions are performed in browsers. Exploring Past Downloadsĭata scientists are (generally) inquisitive folk and tend to accumulate things. You can work with extended attributes from the terminal with the xattr command, but do you really want to go to the terminal every time you want to examine these secret settings (now that you know your OS is keeping secrets from you)? When you’re in a terminal session you can tell that a file has extended attributes by looking for an sign near the permissions column: Apart from that, you can put anything in the value: text, binary content, etc. They key must be a character value & unique, and it’s fairly standard practice to keep the value component under 4K. For instance, macOS uses them to identify when files have passed through the Gatekeeper or to store the URLs of files that were downloaded via Safari (though most other browsers add the :kMDItemWhereFroms attribute now, too).Īttributes are nothing more than a series of key/value pairs. These attributes can serve useful purposes. One of these ways is by associating extended file attributes with files. If you see an error code when syncing, learn about iTunes or Finder error codes.Most modern operating systems keep secrets from you in many ways. If you click “Erase and Sync” in that message, all content of the selected type on your device will be erased and replaced with content from this Mac. Your device can sync with only one Apple Music or Apple TV library at a time. If you see a message that your device is synced with another library, your device was previously connected to another computer. When your Mac and device are on the same Wi-Fi network, your device appears in the Finder sidebar, and it syncs automatically over Wi-Fi whenever it's plugged in to power. You can now unplug your device from your Mac. Scroll down and select “Show this when on Wi-Fi.” Select your device in the sidebar of the Finder window, then click General on the right. When your device is connected to your Mac via USB, you can set up your Mac so that in the future it syncs over Wi-Fi instead. You might then be asked to authorize your computer. If syncing doesn't start automatically, click the Sync button. After you turn on syncing, more syncing options become available.Ĭlick the Apply button in the lower-right corner of the window. In the example pictured, “Sync music onto John's iPhone” turns on music syncing. Then select the Sync checkbox for that content. On the right side of the window, use the row of buttons below the name of your device to select the type of content to sync, such as Music or Photos. Select your device from the list in the sidebar of the window. On your Mac, click the Finder icon in the Dock to open a window in the Finder. Use a USB cable to connect your iPhone, iPad, or iPod touch to your Mac. To keep Messages, Mail, and Notes up to date across devices, you can set up iCloud for Messages, iCloud Mail, and iCloud for Notes. Instead of using the Finder, you can use iCloud Photos, Apple Music, and similar services to keep content from your Mac in the cloud and available to all your devices-even when they aren't near your Mac.
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