Linux: Internet Server Security and Configuration Tutorial
Linux: Internet Server Security and Configuration Tutorial: "Use the command chattr and lsattr to make a file unmodifiable over and above the usual permissions.

Make a file unmodifiable: chattr i /bin/ls
Make directories unmodifiable: chattr -R i /bin /sbin /boot /lib
Make a file append only: chattr a /var/log/messages"
- posted by Gp @ 8:34 AM