setfacl : set file access control lists
[SYNOPSIS] setfacl OPTION FILE
OPTION
-m modify the current ACL(s) of file(s)
-M FILE read ACL entries to modify from file
-x remove entries from the ACL(s) of file(s)
-X FILE read ACL entries to remove from file
-b remove all extended ACL entries
-d operations apply to the default ACL
-k remove the default ACL
-R recurse into subdirectories
-L logical walk, follow symbolic links
-P physical walk, do not follow symbolic links
--restore=file restore ACLs (inverse of `getfacl -R')