; foo: fum -> simple replacement
; foo: fum, fie -> list replacement
; foo: < file -> list replacement from "file"
; foo: = group -> list replacement from UNIX group
; foo: + group -> list replacement by ALL users in /etc/passwd
; foo: fum -> simple replacement
; foo: fum, fie -> list replacement
; foo: < file -> list replacement from "file"
; foo: = group -> list replacement from UNIX group
; foo: + group -> list replacement by ALL users in /etc/passwd