Ps: it is definitely ridiculous that we have to jump through the hoops in order to perform such a primitive change. I know the designers of Mac OS X try hard to keep the system clean and free from endless customizations that plague Windows, but why not at least give the users a choice. Make it customizable, but hide it from plain view. The gang responsible for a month-long plague of fake Mac security software has already updated their 'scareware' to evade defenses Apple put in place late Tuesday, a security company confirmed today. 'More details emerge on Apple's ARM Mac and AirTags—catch the discussion on The CultCast!' Cult of Mac 2/28 '10 Things You Shouldn't Do on Your Work Computer or Phone' Intego Mac Podcast 2/28 'ARM Macs in 2021, iOS 13.4 Beta, AirPods X, Mac Pro news and more on the AppleInsider Podcast' AppleInsider 2/28.
On MacOS terminal, sometimesthe command ls will show an at sign @. What does it mean?
That means the file has Extended file attributes.
Here's a quote from man ls:
If the file or directory has extended attributes, the permissions fieldprinted by the -l option is followed by a '@' character. Otherwise, ifthe file or directory has extended security information (such as an accesscontrol list), the permissions field printed by the -l option is followedby a '+' character.
What's Extended Attribute?
Summary:
- Standard Attributes. For example, creation date, modification date, permission.
- Extended Attributes Stores extra, customizable, small info. For example, author name, file character encoding, short comments, security status.
- Resource Fork. Widely used before Mac OS X , can be considered as a more elaborate extended attribute system, and may also hold main data of the file. (See: Mac OS X Resource Fork and Command Line Tips)
View Extended Attribute with ls
ls -l -@ filename
Show Attribute with xattr
xattr filename
To see how to use xattr, do
man xattrxattr -h
Delete All Extended Attribute
To deletes all extended attributes:
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xattr -c filename
/cdn.vox-cdn.com/uploads/chorus_asset/file/22031882/plague_inc_the_cure_3.png "Mac os versions")
What to Put in Extended Attribute?
Mac Os Catalina
Extended Attributes are name/value pairs. The names areUnicode characters of less than 128 bytes. (they are probably encoded in utf-8 or utf-16) The values can be text or binary, recommended to be less than 4 kibibit.
There's no standardize structure for names. Anyone can add a attribute named for example “xyz” to a particular file. Apple recommends the use of reverse DNS naming scheme to prevent name clash. This is the same scheme adopted by Java. Example:
If you have a domain name, such as “example.com” then your attribute name for file of author can be “com.example.author”. If you don't have a domain name, just make sure the name is not likely used by others.
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