Package xattr provides support for extended attributes on Linux, Darwin and FreeBSD. Extended attributes are name:value pairs permanently associated with files or directories. They are similar to the environment strings associated with a process. An attribute may be defined or undefined. If defined, its value may be empty or non-empty. You can find more details here: @urlhttps://en.wikipedia.org/wiki/Extended_file_attributes, https://en.wikipedia.org/wiki/Extended_file_attributes.