Fixed bug in executable.

diff --git a/bin/forth.jl b/bin/forth.jl
index d2b91ea..f5218ec 100755 (executable)
--- a/bin/forth.jl
+++ b/bin/forth.jl
@@ -1,3 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 
-exec julia -e "import forth; forth.run(\"$1\")"
+if [ -z "$1" ]; then 
+    exec julia -e "import forth; forth.run()"
+else
+    exec julia -e "import forth; forth.run(\"$1\")"
+fi