It dismisses the prompt that the application is from a third party and you need to go into privacy setting to allow. Basically that I trust the source of the application:

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xattr -rd com.apple.quarantine /Applications/Glance.app

The command you provided is related to macOS and its extended attributes. Let’s break down the command:

xattr: This is a command-line utility in macOS that allows users to view and modify the extended attributes of files and directories. Extended attributes are metadata components that can be associated with files and directories for various purposes.-r: This option makes the operation recursive. If the target is a directory, the command will also be applied to its contents, and so on, throughout the directory hierarchy.-d: This option stands for “delete.” It indicates that the specified extended attribute should be removed.com.apple.quarantine: This is the name of the extended attribute that you’re targeting with the command. macOS uses this attribute to mark files and applications that have been downloaded from the internet as “quarantined.” When you try to open a quarantined application for the first time, macOS will alert you and ask for confirmation, as a security measure./Applications/Glance.app: This is the path to the application or file you want to modify. In this case, it is an application named “Glance” located in the /Applications directory.

In summary, the command is used to recursively remove the com.apple.quarantine attribute from the “Glance” application and all its internal files. After running this command, if the Glance.app was previously quarantined, macOS will no longer prompt you about it being downloaded from the internet when you try to run it.

It’s essential to ensure that you trust the source of the application before removing the quarantine attribute, as this bypasses a layer of security that macOS provides for downloaded apps and files.

Origin: Open Preview on MacOS such as md:
References:
Created 2023-10-03