This article was first written in March 2006 for the BeezNest technical website (http://glasnost.beeznest.org/articles/330).
Disclaimer: The purpose of this article is not to explain the purpose of POSIX ACL.
To manipulate POSIX ACL on Debian, with a 2.6 kernel (starting from Sarge):
- install package acl
- edit /etc/fstab to add option acl to the mountpoints where you want to use ACL
- play with getfacl and setfacl
See http://security.linux.com/security/04/07/28/1746258.shtml?tid=23&tid=35 for more info.