A user can be given access to a file or directory in AFS by using the fs program. Using the setacl parameter of the program, the user can be given one or more of these permissions: r (read), w (write), l (list), k (lock), i (insert), d (delete) and a (change ACL).
For example, to give joe access to read, write and list contents of a directory Foo:
$ fs setacl Foo joe rwl
Tried with: OpenAFS 1.6.1-1