>I would like to know if there is a counterpart of LDBASE for UNIX. ?
 
There isn't. By  the way what do  you mean by UNIX, UREP  or HUJI/NJE? In
any case you'd need to be able  to trap interactive messages; if you know
how to do that, the logic is so simplistic that you can write the code in
15 minutes (ok, make it 45 minutes if you have to use 'vi' ;-) ).
 
  Eric