Dealing with OS X extended attributesEdit

Files with extended attributes show up with @ at the end of their mode string in the output of ls -l.

See what the attributes are with: ls -l@

Delete an attribute with xattr -d [attr] [file...] (eg. xattr -d com.apple.quarantine *.crt)

Print info about an attribute (for example the app that created it) with xattr -p [attr] [file..].