SHELL_SCRIPT
  COMMANDS_LIST
    SIMPLE_COMMAND
      GENERIC_COMMAND_DIRECTIVE
        LITERAL
          PsiElement(word)('unset')
      PsiWhiteSpace(' ')
      LITERAL
        PsiElement(word)('todo_list')
      SIMPLE_COMMAND_ELEMENT
        CONDITIONAL_COMMAND
          PsiElement([)('[')
          LITERAL_CONDITION
            VARIABLE
              PsiElement(var)('$todo_id')
          PsiElement(])(']')