![]() If you set an umask incorrectly, you might lose access to files or grant access to other users. You can set the umask in several locations, and each location affects different apps. For example, a default umask of 022 sets permissions of 644 on new files and 755 on new folders. ![]() When you create a file, the umask value is subtracted from a default value (usually 666 for files and 777 for folders) to determine the permissions for the new file or folder. ![]() You might see permissions represented this way when you view them from Terminal. A three-digit number can represent the POSIX permissions for a file. To make a user’s POSIX permissions more restrictive or less restrictive, you can adjust their umask value. These permissions include POSIX permissions and Access Control Lists (ACLs). Every file, folder, and app stored on your Mac has permission settings, which determine which user accounts can read, write to, or run the file, folder, or app. If you make a mistake, you can lower the security of files, folders, or apps on your Mac, or prevent apps from working. Be careful when you change file permissions and umasks. These advanced steps are primarily for system administrators and others who are familiar with the command line. When you create a new file or folder, the umask determines these permissions. ![]() Every file and folder on your Mac has a set of permissions. ![]()
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