CTRL-ENTER now runs a cell in "terminal mode"

In this mode, a new cell is not created after the current cell
is run. Once the cell is run, the current input is cleared, so
it acts just like the terminal.

IPython/frontend/html/notebook/static/js/codecell.js

@@ -228,6 +228,11 b' var IPython = (function (IPython) {'
     };
 
 
+    CodeCell.prototype.clear_input = function () {
+        this.code_mirror.setValue('');
+    };
+
+
     CodeCell.prototype.collapse = function () {
         this.element.find('div.output').hide();
     };

IPython/frontend/html/notebook/static/js/notebook.js

@@ -59,6 +59,10 b' var IPython = (function (IPython) {'
             } else if (event.which === 13 && event.shiftKey) {
                 that.execute_selected_cell(true);
                 return false;
+            } else if (event.which === 13 && event.ctrlKey) {
+                that.execute_selected_cell(false);
+                that.selected_cell().clear_input();
+                return false;
             };
         });