diff --git a/VERSION.txt b/VERSION.txt
index 01008f1..5030bbb 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-6.4.0-d
\ No newline at end of file
+6.4.2-d
\ No newline at end of file
diff --git a/scripttease/library/commands/base.py b/scripttease/library/commands/base.py
index fc78220..9155d51 100644
--- a/scripttease/library/commands/base.py
+++ b/scripttease/library/commands/base.py
@@ -138,6 +138,28 @@ class Command(object):
 
         return "\n".join(b)
 
+    def has_attribute(self, name):
+        """Indicates whether the command has the named, dynamic attribute.
+
+        :param name: The name of the attribute to be checked.
+        :type name: str
+
+        :rtype: bool
+
+        """
+        return name in self._attributes
+
+    def set_attribute(self, name, value):
+        """Set the value of a dynamic attribute.
+
+        :param name: The name of the attribute.
+        :type name: str
+
+        :param value: The value of the attribute.
+
+        """
+        self._attributes[name] = value
+
     def _get_statement(self):
         """By default, get the statement passed upon command initialization.
 
@@ -222,6 +244,31 @@ class ItemizedCommand(object):
 
         return "\n".join(a)
 
+    def has_attribute(self, name):
+        """Indicates whether the command has the named, dynamic attribute.
+
+        :param name: The name of the attribute to be checked.
+        :type name: str
+
+        :rtype: bool
+
+        """
+        return name in self.kwargs
+
+    def set_attribute(self, name, value):
+        """Set the value of a dynamic attribute.
+
+        :param name: The name of the attribute.
+        :type name: str
+
+        :param value: The value of the attribute.
+
+        .. note::
+            This is applied to all command in the itemized list.
+
+        """
+        self.kwargs[name] = value
+
 
 class Sudo(object):
     """Helper class for defining sudo options."""
diff --git a/tests/test_library_commands_base.py b/tests/test_library_commands_base.py
index 115a73c..f6bafb6 100644
--- a/tests/test_library_commands_base.py
+++ b/tests/test_library_commands_base.py
@@ -35,6 +35,10 @@ class TestCommand(object):
         statement = c.get_statement()
         assert "if [[ $?" in statement
 
+    def test_has_attribute(self):
+        c = Command("ls -ls")
+        assert c.has_attribute("testing") is False
+
     def test_init(self):
         c = Command("ls -ls", sudo=Sudo(user="deploy"))
         assert isinstance(c.sudo, Sudo)
@@ -60,6 +64,12 @@ class TestCommand(object):
         c = Command("ls -ls")
         assert repr(c) == "<Command>"
 
+    def test_set_attribute(self):
+        c = Command("ls -ls")
+        assert c.testing is None
+        c.set_attribute("testing", True)
+        assert c.testing is True
+
 
 class TestItemizedCommand(object):
 
@@ -80,6 +90,16 @@ class TestItemizedCommand(object):
         assert "psycopg2-binary" in statement
         assert "django" in statement
 
+    def test_has_attribute(self):
+        c = ItemizedCommand(python_pip, ["Pillow", "psycopg2-binary", "django"], "$item")
+        assert c.has_attribute("testing") is False
+
     def test_repr(self):
         c = ItemizedCommand(python_pip, ["Pillow", "psycopg2-binary", "django"], "$item")
         assert repr(c) == "<ItemizedCommand python_pip>"
+
+    def test_set_attribute(self):
+        c = ItemizedCommand(python_pip, ["Pillow", "psycopg2-binary", "django"], "$item")
+        assert c.testing is None
+        c.set_attribute("testing", True)
+        assert c.testing is True