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Permissions on Copied Items: It's difficult to predict what permissions macOS will assign when you copy files over an external volume, SMB, or FTP.But if you store items for use by multiple people on a permanent basis, then issues can arise. If you're using this folder as a repository for files in transit, then permission problems are unlikely. Sharing a folder: All users on the computer have permission to access items in the Shared folder.For example, improper use of the chmod command can change the permission setting of an item. User error: If you're fiddling with permissions in the Terminal or through a third-party app, mistakes can lead to problems.App Installers: Some installers change permissions on existing items as a necessary part of the installation process, but fails to return them to the proper settings.Permissions stay the same until something or someone comes along and changes them. It simply resets them.įurther, to say Disk Utility repairs permissions makes it sound like permissions can go bad or become corrupted over time.

However, in actuality, the app doesn't repair permissions. In OS X Yosemite and earlier, Disk Utility can verify and repair permissions on some files and folders. In case of a folder, execute means someone can list its contents provided the read permission is also enabled. Execute: Files with the execute permission can behave as a program or script.For a folder, you can make changes to folder contents. Write: User or group members can modify or delete the file.If it's a folder, you can browse the list of items. Read: User or group members can open a file but can't save changes.Next, let's look at the three types of permissions these users can have: Everyone: Use this permission setting to define access for anyone, including local, sharing, and guest users.A group is a set of user accounts joined together so permissions can apply to all members. Group: Every item is also owned by a group.Users usually own most of the items in their home folder. Owner: An item owner is a user who creates the item or copied it to the Mac.Let's break down the three types of users that appear in Mac permission fields: