--- expect-5.43/example/unbuffer.orig	2004-01-25 10:37:49.000000000 +0900
+++ expect-5.43/example/unbuffer	2005-05-31 10:37:19.000000000 +0900
@@ -6,10 +6,17 @@
     # pipeline
     set stty_init "-echo"
     eval spawn -noecho [lrange $argv 1 end]
-    interact
+    close_on_eof -i $user_spawn_id 0
+    interact {
+	eof {
+	    # flush remaining output from child
+	    expect -timeout 1 -re .+
+	    return
+	}
+    }
 } else {
     set stty_init "-opost"
-    eval spawn -noecho $argv
     set timeout -1
+    eval spawn -noecho $argv
     expect
 }