diff --git a/Interlace/lib/core/input.py b/Interlace/lib/core/input.py
index a762ee7..7d79114 100644
--- a/Interlace/lib/core/input.py
+++ b/Interlace/lib/core/input.py
@@ -190,6 +190,13 @@ class InputHelper(object):
         if arguments.output:
             final_commands = InputHelper._replace_variable_for_commands(final_commands, "_output_", [arguments.output])
 
+        if arguments.proto:
+            if "," in arguments.proto:
+                protocols = arguments.proto.split(",")
+            else:
+                protocols = arguments.proto
+            final_commands = InputHelper._replace_variable_for_commands(final_commands, "_proto_", protocols)
+
         return final_commands
 
 
@@ -277,6 +284,11 @@ class InputParser(object):
             help='Specify a port variable that can be used in commands as _port_'
         )
 
+        parser.add_argument(
+            '--proto', dest='proto',
+            help='Specify protocols that can be used in commands as _proto_'
+        )
+
         parser.add_argument(
             '-rp', dest='realport',
             help='Specify a real port variable that can be used in commands as _realport_'