Episode 28 of Linux in the Shell talks about extended attributes and how 
to view them with lsattr and change them with chattr. Attributes are 
discussed in some detail and those that are mutable by chattr are noted.
<br />
<a href="https://www.linuxintheshell.com/2013/04/23/episode-028-extended-attributes-lsattr-and-chattr/">https://www.linuxintheshell.com/2013/04/23/episode-028-extended-attributes-lsattr-and-chattr/</a>
