diff --git a/src/wormhole/scripts/cmd_receive_file.py b/src/wormhole/scripts/cmd_receive_file.py
index a24ea9e..aefdff6 100644
--- a/src/wormhole/scripts/cmd_receive_file.py
+++ b/src/wormhole/scripts/cmd_receive_file.py
@@ -14,6 +14,9 @@ def receive_file(args):
     transit_receiver = TransitReceiver(args.transit_helper)
 
     r = Receiver(APPID, args.relay_url)
+    if args.zeromode:
+        assert not args.code
+        args.code = "0-"
     code = args.code
     if not code:
         code = r.input_code("Enter receive-file wormhole code: ",
diff --git a/src/wormhole/scripts/cmd_receive_text.py b/src/wormhole/scripts/cmd_receive_text.py
index 93cf95b..64ba2da 100644
--- a/src/wormhole/scripts/cmd_receive_text.py
+++ b/src/wormhole/scripts/cmd_receive_text.py
@@ -10,6 +10,9 @@ def receive_text(args):
     from ..blocking.transcribe import Receiver, WrongPasswordError
 
     r = Receiver(APPID, args.relay_url)
+    if args.zeromode:
+        assert not args.code
+        args.code = "0-"
     code = args.code
     if not code:
         code = r.input_code("Enter receive-text wormhole code: ",
diff --git a/src/wormhole/scripts/cmd_send_file.py b/src/wormhole/scripts/cmd_send_file.py
index fb15c68..8858bc4 100644
--- a/src/wormhole/scripts/cmd_send_file.py
+++ b/src/wormhole/scripts/cmd_send_file.py
@@ -16,6 +16,9 @@ def send_file(args):
     transit_sender = TransitSender(args.transit_helper)
 
     i = Initiator(APPID, args.relay_url)
+    if args.zeromode:
+        assert not args.code
+        args.code = "0-"
     if args.code:
         i.set_code(args.code)
         code = args.code
@@ -24,8 +27,11 @@ def send_file(args):
     other_cmd = "wormhole receive-file"
     if args.verify:
         other_cmd = "wormhole --verify receive-file"
+    if args.zeromode:
+        other_cmd += " -0"
     print("On the other computer, please run: %s" % other_cmd)
-    print("Wormhole code is '%s'" % code)
+    if not args.zeromode:
+        print("Wormhole code is '%s'" % code)
     print()
 
     if args.verify:
diff --git a/src/wormhole/scripts/cmd_send_text.py b/src/wormhole/scripts/cmd_send_text.py
index b10ce56..c25620f 100644
--- a/src/wormhole/scripts/cmd_send_text.py
+++ b/src/wormhole/scripts/cmd_send_text.py
@@ -10,6 +10,9 @@ def send_text(args):
     from ..blocking.transcribe import Initiator, WrongPasswordError
 
     i = Initiator(APPID, args.relay_url)
+    if args.zeromode:
+        assert not args.code
+        args.code = "0-"
     if args.code:
         i.set_code(args.code)
         code = args.code
@@ -18,8 +21,11 @@ def send_text(args):
     other_cmd = "wormhole receive-text"
     if args.verify:
         other_cmd = "wormhole --verify receive-text"
+    if args.zeromode:
+        other_cmd += " -0"
     print("On the other computer, please run: %s" % other_cmd)
-    print("Wormhole code is: %s" % code)
+    if not args.zeromode:
+        print("Wormhole code is: %s" % code)
     print("")
 
     if args.verify:
diff --git a/src/wormhole/scripts/runner.py b/src/wormhole/scripts/runner.py
index e857da7..fb99d20 100644
--- a/src/wormhole/scripts/runner.py
+++ b/src/wormhole/scripts/runner.py
@@ -57,12 +57,16 @@ sp_restart.set_defaults(func=cmd_server.restart_server)
 p = subparsers.add_parser("send-text", description="Send a text mesasge",
                           usage="wormhole send-text TEXT")
 p.add_argument("--code", metavar="CODE", help="human-generated code phrase")
+p.add_argument("-0", dest="zeromode", action="store_true",
+               help="enable no-code anything-goes mode")
 p.add_argument("text", metavar="TEXT", help="the message to send (a string)")
 p.set_defaults(func=cmd_send_text.send_text)
 
 # CLI: receive-text
 p = subparsers.add_parser("receive-text", description="Receive a text message",
                           usage="wormhole receive-text [CODE]")
+p.add_argument("-0", dest="zeromode", action="store_true",
+               help="enable no-code anything-goes mode")
 p.add_argument("code", nargs="?", default=None, metavar="[CODE]",
                help=dedent("""\
                The magic-wormhole code, from the sender. If omitted, the
@@ -74,6 +78,8 @@ p.set_defaults(func=cmd_receive_text.receive_text)
 p = subparsers.add_parser("send-file", description="Send a file",
                           usage="wormhole send-file FILENAME")
 p.add_argument("--code", metavar="CODE", help="human-generated code phrase")
+p.add_argument("-0", dest="zeromode", action="store_true",
+               help="enable no-code anything-goes mode")
 p.add_argument("filename", metavar="FILENAME", help="The file to be sent")
 p.set_defaults(func=cmd_send_file.send_file)
 
@@ -91,6 +97,8 @@ p.add_argument("--overwrite", action="store_true",
                output file already exists, the program will refuse to
                overwrite it."""),
                )
+p.add_argument("-0", dest="zeromode", action="store_true",
+               help="enable no-code anything-goes mode")
 p.add_argument("code", nargs="?", default=None, metavar="[CODE]",
                help=dedent("""\
                The magic-wormhole code, from the sender. If omitted, the