HP-UX System Administrator's Guide: Security Management HP-UX 11i v3 (B3921-90020, September 2010)

IMPORTANT: You must use chmod with the -A option when working with files that
have HFS ACL permissions assigned. Without the -A option, chmod will delete the
ACL permissions from the file. The syntax is:
# chmod -A mode file
The chacl command is a superset of the chmod command. Any specific permissions
you assign with the chacl command are added to the more general permissions
assigned with the chmod command.
When a file has ACLs, the ll command displays a plus sign (+) after the permission
string.
If a user.group matches more than one HFS ACL entry, the more specific entry takes
precedence. See Example 5-2.
92 File System Security