todo.txt popular minimalist format task lists, in which, you guessed it, the data is stored in a simple text file. There are a large number of clients for todo.txt, including iPhone and even command line clients. Since this format can be read by both men and machines, you can work with tasks via a simple text editor from any operating system, synchronize them with clouds, such as Dropbox and so on.
Todo Indicator does not provide us with the task editor or something. Clicking on the edit button of the menu display, you will get opened in a text editor file todo.txt. Tasks from your file todo.txt immediately appear in Todo AppIndicator.
Install Todo Indicator:
sudo add-apt-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install todo-indicator
You will not find in the menu Todo Indicator. Instead, after installation, re-enter the system and the led should start automatically. If you don't want to re-enter the system after installation Todo Indicator, press ALT + F2 and run the command: