%f file name without directory %F gives absolute pathname
%s system name
%u user's login name
+%U user's full name
%h mail host name
Decimal digits between the % and the type character specify the
(system-name))
((eq cur-char ?u) ;user name
(user-login-name))
+ ((eq cur-char ?U) ;user full name
+ (user-full-name))
((eq cur-char ?h) ;mail host name
(time-stamp-mail-host-name))
))