I put each task on a line in a file called `to-do.txt` which perpetually lives on my desktop. When I complete a task, I mark `X` on the beginning of the line. W

I put each task on a line in a file called `to-do.txt` which perpetually lives on my desktop. When I complete a task, I mark `X` on the beginning of the line. Whenever the length of the file starts to feel unwieldy, I delete the oldest completed tasks.