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Why are some files in ls -l on Mac OSX (Snow Leopard) tagged with "@"? [duplicate]

Why are some files in ls -l on Mac OSX (Snow Leopard) tagged with "@"? [duplicate]

When doing an ls -l some files are tagged with "@" like this:

Asked by: Guest | Views: 75
Total answers/comments: 1
Guest [Entry]

"They are extended attributes. ls -l@ shows them (mostly they are flags to indicate that the file is coming from the internet, in those cases, when opening the file (or installing a DMG) MacOS will ask if you really want to open it). The xattr command allows you to change them.

There is another one too. ls -lO (upper case O) shows the flags set via chflags command. ls -lO@ shows the file in it's full glory."