}
/**
- * Checks wether the given command is valid
+ * Checks whether the given command is valid
*
* @param $commandName The default command we shall execute
- * @return $isValid Wether the given command is valid
+ * @return $isValid Whether the given command is valid
* @throws EmptyVariableException Thrown if given command is not set
*/
public function isCommandValid ($commandName) {