Utility to work with extended filesystem attributes.
# To list key:value extended attributes for a given file:
xattr -l <file>
# To write an attribute for a given file:
xattr -w <attribute_key> <attribute_value> <file>
# To delete an attribute from a given file:
xattr -d <com.apple.quarantine> <file>
# To delete all extended attributes from a given file:
xattr -c <file>
# To recursively delete an attribute in a given directory:
xattr -rd <attribute_key> <directory>