diff --git a/src/lib/built_ins.ml b/src/lib/built_ins.ml
index 5b6251d..42bdc38 100644
--- a/src/lib/built_ins.ml
+++ b/src/lib/built_ins.ml
@@ -30,6 +30,14 @@ module Options = struct
   type merry = [ `Async ]
   type option = [ posix | merry ]
 
+  let posix_to_letter = function
+    | `Noclobber -> "C"
+    | _ -> ""
+
+  let to_letters t =
+    let nc = if t.noclobber then posix_to_letter `Noclobber else "" in
+    nc ^ ""
+
   let update t options =
     List.fold_left
       (fun d -> function
diff --git a/src/lib/built_ins.mli b/src/lib/built_ins.mli
index 641011e..2836b67 100644
--- a/src/lib/built_ins.mli
+++ b/src/lib/built_ins.mli
@@ -7,6 +7,8 @@ module Options : sig
     async : bool;
   }
 
+  val to_letters : t -> string
+
   type posix = [ `Noclobber | `Pipefail | `Noglob | `Nounset ]
   type merry = [ `Async ]
   type option = [ posix | merry ]
diff --git a/src/lib/eunix.ml b/src/lib/eunix.ml
index 1d2f09a..30d7345 100644
--- a/src/lib/eunix.ml
+++ b/src/lib/eunix.ml
@@ -25,11 +25,9 @@ let delegate_control ~pgid fn =
   let shell_pid = Unix.getpid () in
   Fun.protect
     ~finally:(fun () ->
-      Fmt.pr "Back to the shell\n%!";
       let _ : int = tcsetpgrp 0 shell_pid in
       ())
     (fun () ->
-      Fmt.pr "Delegating...\n%!";
       match tcsetpgrp (Obj.magic Unix.stdin : int) pgid with
       | 0 -> fn ()
       | n -> Fmt.failwith "tcsetpgrp: %i" n)
diff --git a/src/lib/eval.ml b/src/lib/eval.ml
index 20e5524..0b0cc39 100644
--- a/src/lib/eval.ml
+++ b/src/lib/eval.ml
@@ -604,6 +604,11 @@ module Make (S : Types.State) (E : Types.Exec) = struct
               expand
                 ([ Ast.WordName ctx.last_background_process ] :: acc)
                 ctx rest
+          | Ast.VariableAtom ("-", NoAttribute) ->
+              let i = if ctx.interactive then "i" else "" in
+              expand
+                ([ Ast.WordName (Built_ins.Options.to_letters ctx.options ^ i) ] :: acc)
+                ctx rest
           | Ast.VariableAtom (n, NoAttribute)
             when Option.is_some (int_of_string_opt n) -> (
               let n = int_of_string n in