ext_unix_group_acl(8) on Linux
The text 5de5bf177b4e, as Debian 8 (Jessie) shipped it.
Squid UNIX Group ACL helper
Flags it lists
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-d -
-p -
-s
The text 5de5bf177b4e, as Debian 8 (Jessie) shipped it.
Squid UNIX Group ACL helper
-d
-p
-s